# Release notes

New Stuff: - Two new routines for performing MAP inference in factor graphs: - For chain-structured graphs: find_max_factor_graph_viterbi() - For general graphs: find_max_factor_graph_nmplp() - Image Processing - Added more tools for creating image pyramids. See pyramid_down_5_4, pyramid_down_4_3, and pyramid_down_3_2. - Added more image filtering and morphology functions. - Added a set of tools for creating sliding window classifiers: - Added the scan_image() routine. It is a tool for sliding a set of rectangles over an image space and finding the locations where the sum of pixels in the rectangles exceeds a threshold. Also added scan_image_pyramid, which is a tool for running scan_image() over an image pyramid. - Added the structural_object_detection_trainer. This is a tool which formulates the sliding window classifier learning problem as an instance of structural SVM learning. - Added a variety of supporting tools and two object detection example programs. - Added the following functions for computing statistics on vectors: mean_sign_agreement(), correlation(), covariance(), r_squared(), and mean_squared_error() - Added a C++ wrapper for SQLite (see the new database and statement objects)

Non-Backwards Compatible Changes: - Changed the interface to the ridge regression trainer objects so that they report the entire set of LOO prediction values rather than a summary statistic like mean squared error. - Changed the serialization routine for bgr_pixels to store the pixels in BGR order rather than RGB. - Changed the interface for the spatially_filter_image() routine to take the filter as a matrix rather than C-array. Also, now it won't force signed pixel values to 0 if they go negative. - Changed the test_regression_function() and cross_validate_regression_trainer() routines so they return both the MSE and R-squared values rather than just the MSE. - Changed suppress_non_maximum_edges() to use the L2 norm instead of L1 norm for measuring the strength of an edge since this produces a slightly better result.

Bug fixes: - The image_display didn't display overlay rectangles quite right. If you zoomed in you could see that some of the pixels which are inside the rectangle were outside the overlay. Specifically, the right column and bottom row was outside the overlay rectangle. This has been fixed. Now all pixels which are supposed to be part of a rectangle are drawn as being inside the overlay rectangle. - Fixed a bug pointed out by Martin Müllenhaupt which caused the windows socket code to not compile when used with the mingw-cross-env project. - Fixed a bug in the png_loader. If you loaded an image with an alpha channel into something without an alpha channel there were uninitialized values being alpha blended into the image. - Fixed a bug in the cpp_tokenizer that only shows up on newer versions of gcc. It wasn't tokenizing double quoted strings right. - Fixed a bug in spatially_filter_image() which showed up when using non-square filters. The bug would cause the edges of the output image to be incorrect. - Fixed a bug in the matrix class. Expressions of the form mat *= mat(0) would evaluate incorrectly because the *= operator took the right hand side by reference and thus experienced an aliasing problem. The other op= operators had similar problems and have also been fixed. - Fixed a bug pointed out by Justin Solomon which could cause the svr_trainer and svm_c_trainer to produce incorrect results in certain unusual cases.

Other: - Added a more complete set of methods for converting between image space and the downsampled hog grid used by hog_image. Now you can convert from image to hog in addition to hog to image. - Made the integral_image more general by making it templated on the type of scalar used to store the sums.

New Stuff: - Added the check_sub_option() method to the command line parser check object. - Added match_endings to the dir_nav utils. - Added a set_current_dir() function. - Added the distance_to_rect_edge() routine. - Added support for user drawn rectangle overlays and selectable overlays to the image_display widget.

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a bug in the image_display widget. If you switched it between images of a different size while any kind of zoom was in effect it could cause a segmentation fault.

Other:

New Stuff: - You can now add tasks to a thread_pool by value, using the new add_task_by_value() method.

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a bug which caused multiply defined symbol errors during linking if the PNG saving routine was #included.

Other: - Optimized the threaded and distributed structural svm solvers for the case where there are many data samples and the separation oracle is quick to evaluate.

New Stuff: - Added a function for saving to the PNG image format. - Added Austin Appleby's excellent MurmurHash3 hashing code and setup some additional convenience functions. These functions are murmur_hash3() and various overloads of hash().

Non-Backwards Compatible Changes: - Made get_pixel_intensity() more efficient. However, the value returned is slightly different than it used to be for RGB pixel types.

Bug fixes: - Setup proper error handling for libpng in the png_loader. Now if the PNG file is corrupted in the middle it won't just print a message and abort the program. - Fixed a bug in assign_pixel_intensity() that happened when the target pixel was an RGB pixel with an alpha channel.

Other: - Added a Frequently Asked Questions page - Changed the array2d object so you don't have to say array2d<type>::kernel_1a anymore to declare it. Now you just say array2d<type>.

New Stuff: - Added tools for distributing the work involved in solving a structured SVM problem over many computers and CPUs. - Added the bridge. It allows a dlib::pipe to be used for networked communication.

Non-Backwards Compatible Changes: - Removed the DLIB_REVISION macro and replaced it with DLIB_MAJOR_VERSION and DLIB_MINOR_VERSION.

Bug fixes:

Other: - dlib's version control system has switched from Subversion to Mercurial.

New Stuff: - Added the max_sum_submatrix() function to the optimization tools. - Upgraded the pyramid_down function object so it can create color pyramids. Also, added some functions which define the coordinate transforms between different layers in an image pyramid.

Non-Backwards Compatible Changes: - Changed the oca_problem interface to the oca optimizer. Now the optimization_status() function reports back the current risk and risk gap in addition to the overall objective value and objective gap. - Changed the stopping condition for the structured svm to the one suggested by the Joachims paper. Now it stops when the risk gap is below a user supplied epsilon.

Bug fixes:

Other: - Various usability improvements. - Improved the feature vector caching in the structural_svm_problem object. - Some objects were setup as multi-implementation objects but only had one implementation. I went through dlib and switched these to single implementation objects. So for example, to use the dlib crc32 module you used to declare an object of type "crc32::kernel_1a" but now you can just say "crc32". Note that I did this change in a way that maintains backwards compatibility with previous versions. So crc32::kernel_1a is still allowed but that form is officially deprecated. The modified objects are as follows: - base64 - byte_orderer - config_reader - crc32 - pipe - rand

New Stuff: - Added a multiclass support vector machine. - Added a tool for solving the optimization problem associated with structural support vector machines. - Added new functions for dealing with sparse vectors: add_to(), subtract_from(), max_index_plus_one(), fix_nonzero_indexing(), a more flexible dot(), and I renamed assign_dense_to_sparse() to assign() and made it more flexible.

Non-Backwards Compatible Changes: - Renamed max_index_value_plus_one() (a function for working with graphs) to max_index_plus_one() so that it uses the same name as the essentially identical function for working with sparse vectors. - I simplified the cross_validate_multiclass_trainer(), cross_validate_trainer(), test_binary_decision_function(), and test_multiclass_decision_function() routines. They now always return double matrices regardless of any other consideration. This only breaks previous code if you had been assigning the result into a float or long double matrix. - Renamed assign_dense_to_sparse() to assign()

Bug fixes: - Fixed a bug in load_libsvm_formatted_data(). I had forgotten to clear the contents of the labels output vector before adding the loaded label data. - Fixed a bug in the kernel_matrix() function. It didn't compile when used with sparse samples which were of type std::vector<std::pair<> >. Moreover, some of the trainers have a dependency on kernel_matrix() so this fix makes those trainers also work with this kind of sparse sample.

Other: - Added a value_type typedef to matrix_exp so it's easier to write templates which operate on STL containers and matrix objects.
New Stuff: - Added an implementation of the Hungarian algorithm for solving the optimal assignment problem (in the new max_cost_assignment() routine).

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a problem which prevented the any_function unit test from compiling in visual studio 2008.

Other: - Changed the oca optimizer so that it warm starts the QP subproblem rather than resolving it from scratch during each iteration. This improves the speed and stability of the algorithm.
New Stuff: - Added the rr_trainer. It is a version of krr_trainer which is optimized for use with the linear_kernel. - Added the approximate_distance_function() routine. It is the core optimizer behind the reduced2() trainer adapter. - Added an any_function which supports the same functionality as std::function from the upcoming C++0x standard. I added this so dlib can be modified to easily support lambda functions while still being compilable with compilers which don't support the new std::function. - Added overloads of all the GUI event handlers so you can use general functions as callbacks (via any_function). This way, if you have a C++0x compiler, you can use lambda functions with the event handlers. - Added the split() function for splitting up strings.

Non-Backwards Compatible Changes: - Improved the distance_function object by turning it into a properly encapsulated class rather than just a simple struct. I also added overloaded +, -, *, and / operators for this object so you can do the kind of arithmetic you would expect on an object which represents a point in a vector space. This breaks backwards compatibility with the previous interface though as the member variables are now private.

Bug fixes: - Fixed a compile-time error in the kernel_matrix(). - Fixed a bug in an assert in the spatially_filter_image() function. - Applied a patch from Nils Labugt which fixes a runtime bug in the gui_core component. The bug caused a crash when using X11 and Ubuntu 10.10 in certain cases. - Updated code so that it compiles with the clang compiler.

Other: - Updated the image_display widget so you can zoom in and out using the mouse wheel.
New Stuff: - General Stuff - Added the promote template - Added the basic_type template - Added the assign_image_scaled() function - Added the unordered_pair object. - Added the symmetric_matrix_cache() function - Added two new quadratic program solvers. The solve_qp2_using_smo and solve_qp3_using_smo objects.

- Machine Learning Stuff - Added the svm_c_trainer object. It implements C-SVM classification and allows the user to set different C values for each class. - Added the svm_one_class_trainer object. - Added the svr_trainer object. It implements epsilon-insensitive support vector regression. - Added two new any objects. The any_decision_function for containing decision function style objects and the any_trainer for trainers. - Added cross_validate_regression_trainer() - Added test_regression_function() - Added the probabilistic() function. It is a trainer adapter that simply calls train_probabilistic_decision_function(). - Added tools for multiclass classification - Added one_vs_one_trainer - Added one_vs_all_trainer - Added cross_validate_multiclass_trainer() - Added test_multiclass_decision_function()

Non-Backwards Compatible Changes: - invalid_svm_nu_error has been renamed to invalid_nu_error. - Changed the pixel_traits so that signed grayscale pixel types are allowed. This involved adding a few new fields to pixel_traits. I also changed the get_pixel_intensity() function so that its return value is of the same type as the basic pixel type rather than always being unsigned long. - Removed the kernel_type typedef from the normalized function since this meta-object should be capable of working with non-kernel decision functions. - train_probabilistic_decision_function() no longer accepts column vectors of samples and labels. Now it only accepts std::vectors of samples and labels.

Bug fixes: - Fixed a bug in the deserialization code for the sparse kernels. The bug prevented code which used the deserialize() routine from compiling.

Other: - Changed the image display GUI widgets to use the assign_image_scaled() function internally. Now they will accept just about any image and do the right thing. - Modified the type_safe_union so that you can call apply_to_contents() on const type_safe_unions. - Added serialization support for std::pair objects. - Made the train_probabilistic_decision_function() more general by making it work with any kind of trainer object rather than only ones which produce dlib::decision_function objects. I also made it work with trainers that only take std::vectors. - Added overloads to the config_reader's methods to allow it to load directly from a file name given as a string in addition to taking istream objects.
New Stuff: - Added the ability to add/subtract scalar values to/from all the elements of a matrix using the - and + operators. - Added a trust region optimizer. - Added Levenberg-Marquardt and LM/quasi-newton hybrid methods for solving non-linear least squares problems. - Added an any container object.

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a compiler warning and also a runtime bug in sort_basis_vectors(). The bug triggered when all the basis vectors were included in the final answer.

Other: - Added a bunch of overloads to catch operations on diagonal matrices and use more efficient code paths for them. For example, inv(diagm(d)) turns into diagm(reciprocal(d)). Multiplication by a diagonal matrix is now also handled efficiently.

New Stuff: - Added a class for reading JPEG image files. - Added scale_rows(), flipud() and fliplr() matrix functions. - Added console_progress_indicator. It is a tool for measuring how long a task will take. - Added sort_basis_vectors(). It is a function for performing supervised basis selection.

Non-Backwards Compatible Changes: - Renamed the linearly_independent_subset_finder's dictionary_size() member function to size(). This way, linearly_independent_subset_finder objects can be used in many templated functions which expect objects which look like arrays.

Bug fixes: - Changed the assert macros so that they don't use __PRETTY_FUNCTION__ with gcc 4.4.5 since, on Ubuntu at least, this version of gcc segfaults when __PRETTY_FUNCTION__ is used within certain template constructs. - Improved the alias detection capability of kernel_matrix() expressions. Now statements of the form: sample = kernel_matrix(kern, *, sample) can be used since the aliasing of sample will be handled.

Other: - Generally tried to make things more usable. - Optimized matrix expressions such as mat*diagm(vect) - Made the code in chol() more robust to indefinite matrices.

New Stuff: - Added the running_scalar_covariance object. - All the matrix decomposition routines now use LAPACK when DLIB_USE_LAPACK is #defined.

Non-Backwards Compatible Changes: - Removed the dlib::EOTHER constant since it conflicts with visual studio 2010. - Changed the svd functions so you can't supply output matrices which use both column and row major layouts. Now all the output matrices need to use the same memory layout. - Removed the qr_decomposition::get_householder() function.

Bug fixes: - Minor fixes so that dlib compiles in Visual Studio 2010

Other: - Added an overloaded matrix_assign() that handles symmetric kernel_matrix() expressions more efficiently by only evaluating the upper triangular part of the matrix.

New Stuff:

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a compile-time bug in the matrix related to multiplication by subm() expressions when the BLAS bindings were enabled. - Fixed a bug in train_probabilistic_decision_function() which could cause it to go into an infinite loop when working with very large datasets.

Other:

New Stuff: - Added a reference_wrapper implementation and modified the thread_function slightly so it works with it. - Added an implementation of kernel ridge regression. - Added a simple newton search strategy for optimizing functions.

Non-Backwards Compatible Changes: - If you have created your own matrix expressions then its possible this new release will cause them to not compile.

Bug fixes: - Fixed a bug in scale_columns. It said it didn't have any destructive aliasing when in fact it destructively aliased its second argument. - Fixed a bug in the random number generator where setting the seed back to "" didn't result in the object going back to it's initial state.

Other: - Reorganized the matrix expression code. It's now much simpler and the library includes a new example program which details the steps needed to create new matrix expressions. - Changed the train_probabilistic_decision_function() routine so that it uses a more numerically stable method to perform its maximum likelihood optimization. - Added missing get/set epsilon functions to the RVM training objects. I also changed the default epsilon from 0.0005 to 0.001.
New Stuff: - Added the simplify_linear_decision_function() routines. - Added the find_approximate_k_nearest_neighbors() function. - Added the fill_lisf() function.

Non-Backwards Compatible Changes: - Made the sample_pair have a default distance of infinity instead of the max floating point value. I also reworked the graph creation functions to make them a little more versatile. Now you can use infinite distances to indicate that certain nodes are not connected at all. - Changed the linear_manifold_regularizer to normalize the regularization parameter by the sum of edge weights instead of the sum of edges.

Bug fixes: - Fixed a bug in the timer_kernel_2 object. In certain rare cases it would stop calling the action function and essentially shut down without being told to do so.

Other: - Made the reduced() and reduced2() functions more efficient. - Many small usability improvements here and there.

New Stuff: - Added the svm_c_ekm_trainer. It is a kernelized version of the fast linear trainer svm_c_linear_trainer. - Added the linear_manifold_regularizer and some supporting tools. - Added the sum_rows(), sum_cols(), join_rows(), join_cols(), reshape(), and pointer_to_matrix() functions. - Added the randomly_subsample() function.

Non-Backwards Compatible Changes:

Bug fixes: - Fixed some minor compile time bugs on certain older compilers.

Other: - Updated the += and -= matrix operators to be a little more flexible. Now if you try to apply them to a matrix of the wrong size it will automatically resize the target matrix and just do a normal assignment. - Removed the requirement that you load dng files into an image of the exact pixel type that created the file. Now you can use any pixel type. I also changed the code so that grayscale pixels with more than 16 bits get saved as 16 bit grayscale images instead of 8 bit images.

New Stuff: - Added the solve_qp_using_smo() function to solve certain quadratic programs. - Added the oca object. It is an implementation of the Optimized Cutting Plane Algorithm. - Added a linear SVM trainer that uses oca. - Added an implementation of the Histogram of Oriented Gradients algorithm - Added a simple tool for making image pyramids - Added the running_covariance object - Added a simple linear (i.e. non-kernelized) kmeans implementation - Added support for serializing dlib::int64 - Added some functions to load and save LIBSVM formatted data files.

Non-Backwards Compatible Changes: - Changed the definition of dlib's sparse vector format to require unsigned integral keys. Having this requirement is nice because it creates a simple correspondence between dense vector index values and sparse vector keys. The previous sparse vector definition was excessively generic. - Renamed sparse_vector::dot_product() to sparse_vector::dot() so that both dense and sparse vectors have a global function with the same name (i.e. dot()).

Bug fixes: - Fixed a bug discovered by Mitchell Peabody. In some instances trying to deserialize a std::vector would fail to compile.

Other: - Increased the number of template arguments of the type_safe_union from 10 to 20. Additionally, I made the get_id() function public and renamed it to get_type_id(). I also added a comment explaining the serialization format of type_safe_union objects. - Moved the optimization algorithms into their own page in the documentation. - Added a Suggested Books page to the documentation

New Stuff: - Added the ability to compute transformation matrices that map between the representations used by different empirical_kernel_maps. Also added the ability to compute projection error. - Added the random_subset_selector object. - Added the compute_mean_squared_distance() function.

Non-Backwards Compatible Changes: - Modified the logger's hook implementation so that it uses a special stream buffer instead of an std::ostringstream. This way logging doesn't cause memory allocations. This breaks backwards compatibility with the previous hook function API but only slightly. The new hook functions must take a const char* instead of std::string. - Added the const_ret_type typedef to the matrix_exp. It is now required that all matrix expressions define this type. This enables the expressions to return elements by constant reference when appropriate rather than always returning by value.

Bug fixes: - Fixed a bug in the matrix BLAS bindings that caused BLAS to return an invalid argument error. The error occurred when general matrix multiply expressions were transposed and didn't result in a square matrix. E.g. mat = trans(a*b) where mat isn't square. - Fixed potential compile time bugs in the comparison operators for futures. - Added a missing check for division by zero in the SURF feature extractor. - Modified the find_min_single_variable() function so that it is more robust when working with functions that are made up of a bunch of constant value strips. Previously, these kinds of functions could cause the optimization to fail.

Other: - Changed the regression test suite so that when it sets the logging level it now sets it for all loggers. Not just ones that start with "test."

New Stuff: - Added some MATLAB style thresholding relational operators to the matrix. - Added the kernel_matrix() functions. - Added the empirical_kernel_map object. - Added the discriminant_pca object. - Added the read_write_mutex object.

Non-Backwards Compatible Changes: - Renamed the support_vectors member of the decision_function and distance_function classes to basis_vectors. This name more appropriately reflects how these two classes are used within the library. - Changed the matrix_exp interface slightly. This could only impact users who created their own custom matrix expressions. If you don't get a compiler error then you don't have to worry about it.

Bug fixes: - Fixed a minor error in the LBFGS code. - Added a missing check for division by zero to the kcentroid, krls, and linearly_independent_subset_finder classes. If someone added the zero vector to them as the first training example a division by zero could result. - There were a few cases where the code wouldn't compile when using matrices of complex numbers. There was also a runtime bug that triggered when a rank 1 update was performed where one of the vectors was conjugated and two or more transposes were used in certain positions. This bug caused the wrong output to be computed if the BLAS bindings were used. Both of these bugs have been fixed. - Fixed a bug in the http server that affected cookies with certain kinds of data. The result was invalid data being sent back to the web browser.

Other: - Generally improved the BLAS bindings for the matrix object.

New Stuff: - Added the pointer_to_column_vector function. - Added the BOBYQA algorithm for derivative-free optimization. - Added some functions to make it easy to do a line search on a function of a single variable when derivatives are not available.

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a bug in the cpp pretty printer. It wasn't parsing exponentiated numbers like 1e100 correctly.

Other: - Added a model selection example program using grid search and the new BOBYQA algorithm.

New Stuff: - Added an implementation of the L-BFGS algorithm for unconstrained non-linear optimization.

Non-Backwards Compatible Changes: - Refactored the optimization code. It is now much more flexible but this resulted in changes to the API. See the optimization example program for a discussion of the new API.

Bug fixes: - Fixed a bug in the get_filesystem_roots() roots function that prevented it from compiling.

Other:

New Stuff: - Added the ability to use a kernel cache to the batch_trainer object. - svm_pegasos can now be configured to use two different lambda arguments for use with unbalanced data. - Added the reciprocal_max() and dot() matrix functions. - Added the bgr_pixel and cv_image objects so that OpenCV images can be easily used with dlib routines.

Non-Backwards Compatible Changes: - I changed the batch trainers so that they always call clear() on the trainer being used before training begins. - Modified the svm_pegasos class so that the user can set independent lambda parameters for each class. This breaks backwards compatibility with the previous interface slightly and changes the serialization format of this class. - Split the vector_normalizer into a normal normalizer and a pca normalizer version. - The zoomable_region widget now uses exponential rather than linear zoom scaling since this is much more pleasing to use. There is now a new requirement on the zoom increment that it must be between 0 and 1.

Bug fixes: - Fixed a bug in the cross_validate_trainer_threaded() function. It could deadlock if more than about 10 folds were requested. - Fixed the serialization functions for the normalized_function object. They will now work with custom normalizer function objects. - Fixed a minor bug in the zoomable_region::set_min_zoom_scale() function. It didn't always end up zooming in a smooth sensible manner after this function was called.

Other: - Made the thread_function object more general. It can now handle arbitrary functions of up to four arguments.

New Stuff: - Added the reshape_to_column_vector() function. - Added a hook to the logger object that lets you set a different kind of output logging destination (in addition to the std::ostream supported already). - Upgraded the scoped_ptr so that it can handle array pointers as well as customer deleter functions. - Added overloads of the kernel_derivative object for all the kernels in dlib.

Non-Backwards Compatible Changes: - Reworked the config_reader interface a little to make it easier to use. In particular, I removed the enumerator over blocks in favor of a simple get_blocks() function that just returns a std::vector of all the blocks. I also removed the requires clauses on the block and key accessor functions and instead made a request for a non-existent key/block result in a non-fatal exception. This way users can let the config reader perform a more natural role in config file validation (by catching this exception and acting accordingly). - It is now illegal to multiply matrices of size zero together.

Bug fixes: - Fixed the gaussian() function used by the SURF code. It wasn't computing a properly weighted Gaussian function. - Fixed a few things in various parts of the code to avoid compiler errors in certain use-cases. - Added a missing rethrow statement. The xml parser would eat exceptions thrown by event handlers rather than letting them propagate out as documented in the specification.

Other:

New Stuff: - Added an implementation of the SURF algorithm which includes the following new objects and functions: integral_image, hessian_pyramid, interest_point, surf_point, compute_dominant_angle(), compute_surf_descriptor(), haar_x(), haar_y(), get_interest_points(), and get_surf_points(). - Added the zeros_matrix() and ones_matrix() functions. - Added serialization support to the type_safe_union object. - Added the grow_rect() and shrink_rect() functions. - Added the get_files_in_directory_tree() function. - Added the null_trainer_type object. - Added the roc_trainer_type object.

Non-Backwards Compatible Changes: - Removed some extraneous get_kernel() functions from some of the trainer adapter classes since they really aren't needed.

Bug fixes: - Changed the socket read/write code so that it can handle a large number ( > 2 billion) of bytes in I/O calls. - Added a missing type cast to the reciprocal() function to fix a compile time error you get when you use it with complex<float> type matrices. - Fixed a bug in the assign_border_pixels() and zero_border_pixels() functions. Their contracts said there was no upper limit on the size of the border that could be assigned/zeroed but the implementations failed to handle the case where the border was bigger than the image.

Other: - Generally cleaned up the code and documentation here and there. - Added in Steven Van Ingelgem's patches to improve the usability of the HTTP server object. - Updated the load_bmp() function so that it is capable of reading BMP files that have been compressed with the RLE compression sometimes used for 8bit BMP files. - Merged in Miguel Grinberg's patch to add a non-blocking read() function to the connection object.
New Stuff: - Added a set of kernels that can operate on sparse vectors. - Added the image_window and image_display objects. - Added the rotate_point() function and the point_rotator object.

Non-Backwards Compatible Changes: - Added Steven Van Ingelgem's patch to add the body of data posted back to the server into the incoming data object given to the server_http::on_request() handler. This removes the content_length field and replaces it with a string that contains the body of content data.

Bug fixes: - Fixed a compile time bug in the offset_kernel.

Other: - Added optimized overloads of the kcentroid object for various linear kernels. - Changed all the tests in the dlib test suite to use a new DLIB_TEST macro instead of DLIB_CASSERT since the tests really aren't technically assertions

New Stuff: - Added the strings_equal_ignore_case() functions

Non-Backwards Compatible Changes: - Changed the on_request() function in the http server - Changed the serialization format of the kcentroid and svm_pegasos objects - By default, the kcentroid now keeps the most linearly independent dictionary vectors rather than the newest

Bug fixes:

Other: - Split the algorithms documentation page into three pages, algorithms, machine learning, and bayes nets. - Merged in Steven Van Ingelgem's patch to cleanup the HTTP server and add new functionality. This breaks backwards compatibility with the previous on_request() interface but it is easy to update old code and it is now much cleaner and easier to use. - Changed the kcentroid so that you can tell it to keep the most linearly independent vectors rather than the newest vectors. I then changed the svm_pegasos object so that it has a max number of support vector setting so that the user can supply an upper limit on the number of support vectors to use.

New Stuff: - Matrix related - Added the find_min_and_max(), index_of_min(), index_of_max(), trace(), randm(), linspace(), logspace(), and cartesian_product() functions. - Machine learning related - Added the offset_kernel - Added some functions to the kcentroid to allow the user to compute the inner_product of kcentroids as well as a few other useful things. - Added a kernelized version of the Pegasos SVM training algorithm.

Non-Backwards Compatible Changes: - Changed the range() function so that it returns row vectors instead of column vectors.

Bug fixes: - Changed threading code to avoid a potential race condition during program termination. - Fixed a few incorrect DLIB_ASSERT statements - Fixed a bug in the way Content-type was handled in HTTP posts. - Fixed a bug in subm() that showed up when statically dimensioned row vectors were used to select a sub matrix.

Other: - Added some functions to the rectangle to make it easy to get the corner points. - The cross validation functions no longer allow invalid_svm_nu_error exceptions to escape. Instead, they are assigned low CV scores. - Made std_vector_c able to copy directly from std::vector objects. - Added a get_socket_descriptor() function to the connection class.

New Stuff: - Matrix related - Added QR, LU, Cholesky, and eigenvalue decomposition class objects - Added overloads for rowm() and colm() that allow you to pick out less than an entire vector - Added the lowerm() and upperm() functions - Added the const_temp_matrix class

Non-Backwards Compatible Changes: - Renamed the cholesky_decomposition() function to chol()

Bug fixes: - Fixed some errors in the requirements for calling the new rowm() and colm() functions. - Fixed dlib::abs() so that it returns the right type when used with complex matrices. - Fixed a race condition in the logger object. It was missing a needed call to unregister_thread_end_handler(). What could happen in some scenarios is, during program termination, a global part of the logger object could be destructed when it still had outstanding thread end handlers registered to it.

Other: - Added an example program that shows how to use the optimization functions. - Gave the matrix object the ability to factor expressions containing trans() function calls into more efficient forms. - Generally cleaned up the matrix code
New Stuff: - Added the multi-line text_box GUI widget. - Added the type_safe_union object

Non-Backwards Compatible Changes: - Renamed the array::expand() function to array::resize() since it does basically the same thing as std::vector::resize() and more than one user has told me they found the name "expand" to be confusing.

Bug fixes:

Other: - Added an example showing how to use the type_safe_union and pipe together. - Added a page to the documentation that discusses the dlib coding standards and how to contribute to the project.
New Stuff: - Added the bound_function_pointer object. - Added support for futures to the thread_pool object. - Added a set of objects that makes it possible to create simulations of quantum computing algorithms. - Added copy and paste support to the text_field. - matrix object stuff - Added the range() function as well as overloads of all the various sub-matrix selection functions so that you can pick out slices of matrices like in Matlab. - Added a new template argument to the matrix object that allows the user to select the memory layout. Also added a row_major_layout and column_major_layout. - The matrix object can now be initialized using a comma separated list of values.

Non-Backwards Compatible Changes: - Changed the fatal_error exception class so that it aborts your program and prints a message if you try to construct it more than once since doing so indicates that you ignored the first fatal error. - The way matrix expressions work in the library has been changed since the last release. So if you created custom matrix expressions then they will need to be updated to use the new matrix expression stuff.

Bug fixes: - Fixed a minor bug in how the zoomable_region widget drew itself after a resize in some cases. - Fixed a problem with draw_line where it didn't always redraw the line properly.

Other: - A lot of the matrix code has been refactored and optimized. The matrix object will now introduce temporary objects when doing so results in better performance. I also added a simple system for binding arbitrary matrix expressions to optimized BLAS routines. - Cleaned up the vector and point classes. Now there is only one class, the vector class, and it is capable of representing everything the old vector and point class could. I also added code to make sure the vector class does the appropriate type promotions when vector objects with different types are used together. - Made the vector class inherit from matrix
New Stuff: - Added user settable styles to most of the gui widgets - Added the diagm(), svd2() and svd3() matrix functions - Added the thread_pool object

Non-Backwards Compatible Changes: - Removed the arrow_button widget and moved its functionality into the button widget. - Renamed the dragable class to draggable - Removed the confusing and unnecessary hidden bool argument to the gui widget style drawing functions. - Changed some of the events that are about the mouse leaving a widget so that they still trigger even if the widget has been disabled or hidden.

Bug fixes: - Added some missing mutex locks to the scroll_bar widget - Fixed a bug in the fill_gradient_rounded() function. It didn't always draw the entire rectangle. - Fixed a compile time bug in the pinv() function. It didn't compile when used on statically sized matrices when they weren't square.

Other: - The member_function_pointer object now never calls new or delete. So it is safe to use in a real time environment.

New Stuff: - Added the sort_columns() and rsort_columns() functions - Added the vector_normalizer object - Added the normalized_function object. - Added a tensor_product() function for the matrix object.

Non-Backwards Compatible Changes:

Bug fixes: - Made it so that the gui event handler thread isn't created at all unless some part of an application calls some of the gui_core code. In the previous release the event handler thread was executed briefly during program termination and could cause problems if no windowing environment was available. - Fixed an #include statement in the matrix utilities so that it works even if you don't specify an include path argument to your compiler.

Other:

New Stuff: - Added a thread safe shared pointer object - Added the popup_menu_region widget.

Non-Backwards Compatible Changes: - The on_wheel_up() and on_wheel_down() gui events now take an unsigned long argument. - Removed the register_program_ending_handler() function from the threading API and also changed the dlib thread pool so that it no longer causes a terminating program to wait for any outstanding threads to finish before allowing the application to end. - Changed the serialization format of the linearly_independent_subset_finder class. - Changed all the font pointers in the gui API's interfaces to shared_ptr_thread_safe objects.

Bug fixes: - Made the kkmeans class actually use the min_change parameter. - Fixed a bug in the linearly_independent_subset_finder object. Also added a way to set a minimum tolerance. - Fixed a bug in the scrollable_region widget that caused it to scroll in an unpleasant way when the horizontal and vertical scroll increments weren't set to the same value. - Made one of the arguments to font::draw_string() not be a reference because some versions of gcc don't end up doing the right thing when -O3 is supplied. - Fixed a bug in the covariance() function that prevented it from compiling sometimes.

Other: - Changed the gui core code around so that it should be safe to make window objects at the global scope. - Added more control over how the scrollable_region scrolls its region. You can now adjust how much it scrolls when the mouse wheel is scrolled as well as enabling scrolling via a mouse drag. - Modified the library so that it compiles with the Intel compiler. - Added some example programs that use the relevance vector machine

New Stuff:

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a bug in the tooltip widget - Fixed the cmake option to toggle the ENABLE_ASSERTS macro - Fixed some bugs in the rvm - Fixed the serialization code for the kkmeans object so that it actually works - Fixed a bug that can trigger when the thread_specific_data object is destructed - Fixed a bug in the directory navigation gui. If you tried to go into a drive on windows that wasn't mounted you got an error. This is now fixed.

Other: - Made the dir_nav stuff work with std::vector and dlib::std_vector_c as well as dlib::queue objects. - Generally cleaned up a bunch of things

New Stuff: - Added relevance vector machine regression and classification support. - Added the cross_validate_trainer_threaded() function - Added the length and length_squared matrix functions.

Non-Backwards Compatible Changes:

Bug fixes: - Changed gui code a little so that windows don't popup in funny places when used with the cygwin X windows system.

Other: - Made it easier to use the scoped_ptr with the TCP connection object - Optimized the matrix object a little

New Stuff: - Machine Learning - Added the ability to compare kcentroid objects to each other - Added the rank_features() function - Added the distance_function object - Added the reduced_decision_function_trainer object and reduced() function - Added the reduced_decision_function_trainer2 object and reduced2() function - Added a radial basis function network trainer - Added the linearly_independent_subset_finder object - Added the sigmoid_kernel - Matrix Utilities - Added the inv_upper_triangular() and inv_upper_triangular() functions.

Non-Backwards Compatible Changes: - Refactored a bunch of the kernel learning code into a much cleaner form. But this does change the interface to all the training functions.

Bug fixes: - Fixed a bug in the min and max calculation in the running_stats object - Removed a bug in the sum() and variance() functions that caused them to seg fault when they were used on certain matrix of matrix objects. - Added a missing check for division by zero to the conjugate gradient optimization functions. - Added some missing member variables to the .swap and serialization functions for the kcentroid object. So now they should work right.

Other: - Added an option to the cmake file to toggle the DLIB_ASSERT macro - Added an option to the cmake file to toggle the dlib stack trace macros - Made the library compile in Cygwin

New Stuff: - Merged in Keita Mochizuki's unicode patches to the GUI components. So the dlib GUI now has better unicode support. - Added the remove_row and remove_col matrix functions. Also made all three of the above functions capable of taking arguments at run time as well as compile time. - Added the ability to cap the number of dictionary vectors used by the krls and kcentroid object at a user specified number. - Added the pick_initial_centers() function - Added the running_stats object

Non-Backwards Compatible Changes: - Changed the interface to the krls and kcentroid objects somewhat. - All of the style objects in the GUI part of the library now use dlib::ustring instead of std::string. This only matters to you if you have made your own style objects. - Changed the serialization format of the krls, kcentroid, and directed_graph_drawer objects. Note that is also means that the files saved by previous versions of the bayes_net_gui_ex program won't load with the current version.

Bug fixes: - Fixed an aliasing bug in the set_subm(), set_rowm(), and set_colm() functions. It was possible that you could get incorrect results if you used these functions to copy one part of a matrix to another part of the same matrix if the two areas overlapped. - Fixed a minor numerical error in the krls code so now it gets slightly better results.

Other: - Made the types generated by the matrix operations a lot shorter. This avoids some compiler warnings from visual studio and even some potential internal compiler errors in some instances.

New Stuff: - Added some macros that allow dlib to create a stack trace - Added the wrap_function and is_function templates. - Added two new events to the text_field object. One for detecting when the user hits enter and another for detecting when input focus is lost. - Machine Learning - Added a kernel based centroid estimator/novelty detector - Added a kernel based k-means clustering algorithm - Numerical - Added an identity_matrix() function that can take a runtime defined size. - Added a bunch of unconstrained optimization stuff to the library. It now has a conjugate gradient optimization algorithm as well as a quasi-newton algorithm. - Added the set_subm, set_rowm, and set_colm functions.

Non-Backwards Compatible Changes: - In the krls object: Added a requires clause to the set_tolerance() member function and renamed clear() to clear_dictionary().

Bug fixes: - Fixed a bug in the requires clause of the subm() function. It was more restrictive than it should have been.

Other: - Added example programs for the krls object as well as the new kcentroid and kkmeans objects.

New Stuff: - Added an implementation of the kernel recursive least squares algorithm

Non-Backwards Compatible Changes: - Broke backwards compatibility in the directed_graph_drawer's serialization format when I fixed the bug below.

Bug fixes: - Fixed two bugs in the directed_graph_drawer widget. First, it sometimes threw a dlib::fatal_error due to a race condition. Second, the color of the nodes wasn't being serialized when save_graph() was called. - Made vector_to_matrix() work for std::vector objects that have non-default allocators.

Other: - Added some stuff to make people get a really obvious error message when they set up the include path incorrectly.

New Stuff: - Added the vector_to_matrix() function. - Added a cholesky_decomposition() function. - Added the toggle_button GUI widget - Added a default toggle button style as well as check box and radio button styles. - Added a single click event to list_box - Added a save_file_box() and open_existing_file_box() function.

Non-Backwards Compatible Changes: - Changed the check_box and radio_button widgets to be specializations of the new toggle_button object. This is a nearly backwards compatible change except that the events registered to check_box and radio_button clicks must now take the form void event(toggle_button&) or void event(void) instead of the previous void event(check_box&) and void event(radio_button&). - Removed the is_mouse_over bool from the button_style::draw_button() function.

Bug fixes: - Fixed a compiler error in mingw. - Changed the preprocessor checks for the wchar_t overload of is_built_in_scalar_type so that it works properly with visual studio.

Other: - Added a Bayesian Network GUI that allows you to create a network and serialize it to disk.
New Stuff: - GUI Related - Added the scrollable_region widget - Added the text_grid widget - Added an event to the text_field so you can tell when the user modifies it. - Added the fit_to_contents() function to the tabbed_display widget. - Bayesian Network Related - Added the node_first_parent_assignment(), node_next_parent_assignment(), and node_cpt_filled_out() functions.

Non-Backwards Compatible Changes: - Reverted the change in 17.0 where I made drawable::lastx and drawable::lasty not match the current location of the mouse inside the on_mouse_move() event. I changed this back to how it was before, so now lastx and lasty represent the most current record of where the mouse is in *all* events. - Changed the functions that control text color in the label and text_field widgets to use rgb_pixel objects. Also added a function to set the background color of a text_field.

Bug fixes: - Fixed a bug in the bayesian_network_join_tree object that caused it to compute incorrect results for some networks. - GUI Related - Fixed a minor bug in the cursor drawing of the text_field gui widget. - Fixed a bug in the compute_cursor_rect() function. It would return an incorrectly positioned rectangle for 0 length strings. - Changed the way wchar_t is handled in the serialize.h file. Now everything should compile correctly in visual studio regardless of how you set the /Zc:wchar_t compiler option. - Fixed a bug in the menu_bar widget. One of the members wasn't being initialized when it needed to be. - Fixed a bug in the tabbed_display where it didn't redraw itself correctly after it was moved by set_pos()

Other: - Changed the xml parser so that it counts line numbers from the start of the input stream instead of from the root tag. - Changed the xml parser so that you will only get the fatal_error event once if it occurs.
New Stuff: - Added a zoomable_region widget - Added a directed_graph_drawer widget

Non-Backwards Compatible Changes: - Changed the first_pixel argument of the draw_string() function to be a rectangle like all the other draw functions now use.

Bug fixes: - Fixed a bug in the tooltip widget that was triggered when calling its member functions without calling set_tooltip_text(). This also fixed a bug in the button object that triggered when calling some button functions that referenced the tooltip widget. - Fixed a problem in the draw_circle and draw_solid_circle functions. They didn't draw themselves quite correctly in all cases.

Other:
New Stuff: - Added a png_loader object - GUI related - Added a popup_menu widget - Added a menu_bar widget - Added a tooltip widget - Added a user selectable style to the gui button. - Added the draw_rounded_rectangle() and fill_gradient_rounded() functions - Added the mouse_over_event object to the base_widgets and made the button_action inherit from it. - Added the drawable::next_free_user_event_number() function - matrix and geometry: - Added a size() function to matrix_exp and matrix_ref objects. - Added a class that represents 2D points - Added the following matrix functions: - squared(), cubed(), get_rect(), a subm() function that takes rectangles, and normalize() - Added the following rectangle functions: - area(), centered_rect(), translate_rect(), move_rect(), resize_rect(), resize_rect_height(), resize_rect_width(), and nearest_point()

Non-Backwards Compatible Changes: - Renamed atom() to array_to_matrix() - Moved the rectangle object from the gui_core into a new geometry folder (only matters if you were directly including the rectangle file) - Moved the vector object into the geometry folder. Also removed the kernel_1a stuff. So there is now only one possible vector implementation. - Changed the default position for a rectangle to (0,0) instead of (1,1) - Added edge data to the directed_graph. This breaks backwards compatibility with the previous serialization format for directed_graphs. - GUI related: - Changed the base_window::on_keydown event signature so that it now reports more keyboard modifier keys (e.g. alt) - Made the functions for drawing on canvas objects take points and pixels instead of just a bunch of integers. Also changed the order of the arguments so that the canvas comes first, followed by the location to draw on, then what to draw. - Moved the canvas drawing functions into the gui_widgets/canvas_drawing.h file. - Modified the drawable_window so that the drawable::lastx and drawable::lasty fields are updated after calls to on_mouse_move. This way the x and y that go into the on_mouse_move actually tell you something.

Bug fixes: - Fixed a bug in the floating point serialization code. It didn't handle NaN or infinities correctly. - Fixed a bug in the win32 version of the gui_core component. It was possible that calling set_size(), set_pos(), or set_title() could cause the program to deadlock. - Made the load_bmp() function more robust in the face of weirdly written BMP files. - Modified the draw_circle() and draw_solid_circle() functions so that they only touch each canvas pixel once. This avoids messing up alpha blending if an rgb_alpha_pixel is used.

Other: - Removed the old win32 only gui code in the dlib/gui folder. - Changed the default GUI font to a nicer Sans Serif font
New Stuff: - Added another constructor to the thread_function object. Now it can take proper function objects as well as normal function pointers. - Added the probabilistic_decision_function object and svm_nu_train_prob() function.

Non-Backwards Compatible Changes: - Changed the svm train functions so that the cache_size argument now measures the max number of megabytes of memory to use rather than number of kernel matrix rows to cache. It's default value is now 200MB. - changed the type typedef in the SVM kernel function objects to be named sample_type instead of type.

Bug fixes: - Fixed a bug in the trim, rtrim, and ltrim functions. They didn't return empty strings when the input string contained all trim characters. - Fixed a bug in the decision_function's copy constructor

Other: - Added an optimization to the working set selection for the svm training code. Now the algorithm will prefer to select indices that are in the kernel matrix cache when possible. - Fixed a problem with the chm documentation file where many of the links didn't work. - Made the support vector functions capable of operating with floats, doubles, and long doubles instead of just the double type.
New Stuff: - Added aversion of the draw_line() function for images. - Added the atom(), rowm(), colm(), and subm() matrix functions. - Added some push/pop_back() functions to the array object that are similar to the ones in the std::vector. - Added the std_vector_c class that wraps std::vector and checks its function's preconditions. - Added the polynomial_kernel object for use with the svm algorithm.

Non-Backwards Compatible Changes: - Changed the svm_nu_cross_validate() function to return a vector of both the +1 and -1 cross validation accuracies.

Bug fixes: - Fixed a bug in the list_box that caused it to not hide itself properly when told to do so. - Fixed canvas::fill() gui function so that it should work right on 64 bit platforms.

Other:
New Stuff: - Added memory manager support to the matrix object.

Non-Backwards Compatible Changes: - Made the assign_pixel() function saturate grayscale values bigger than the target pixel type can handle. Previously it would just truncate the numbers. - Removed rand_kernel_1 and rand_kernel_2 because they gave very inferior results compared to rand_kernel_3. I then renamed rand_kernel_3 to rand_kernel_1. - Renamed rand::get_random_number() to get_random_8bit_number() and also added a get_random_16bit_number() and get_random_32bit_number() - Added a checksum to compress_stream_kernel_1 and kernel_2. This breaks backwards compatibility with the previous versions. That is, the new implementations will complain that decompression fails if you give them data compressed with the old non-checksum version of the compression routines. - Removed the width() and height() functions from the array2d object. Now only the equivalent nc() and nr() member functions remain. - Changed array2d::set_size(width,height) to set_size(num_rows, num_cols). That is, I switched the order of the two arguments to this function. The reason for doing this is to make it have the same form as the set_size() member of the matrix object. This way the usage of the set_size() member for these two very similar data structures is the same. Hopefully this will reduce confusion rather than make things worse.

Bug fixes: - Fixed a bug in the image_widget. It didn't repaint the screen all the way if you gave it a smaller image to display. - Fixed a bug in the cat() function that caused the state of the queue to be broken if you called cat with an empty queue. - Made the queue_sort_1 use a better sorting algorithm. In particular, it will not sort slowly for nearly sorted data. - Fixed a bug in the queue_kernel_2 object that caused it to not work correctly with the non-default memory managers.

Other: - Added example code for the member_function_pointer as well as the matrix object. - Added some more regression tests and made some of the longer running ones execute a lot quicker. - Made the unit test suite easier to use. Now tests just throw an exception to indicate an error rather than returning an error code. - Added an example program for the multi-layer perceptron neural network.
New Stuff: - Added the is_signed_type and is_unsigned_type templates - Image Processing stuff - Added the assign_all_pixels() function - Added the assign_border_pixels() function - Added the assign_pixel_intensity() function - Added the auto_threshold_image() function - Added the binary_union() function - Added the edge_orientation() function - Added the get_histogram() function - Added the get_pixel_intensity() function - Added the hysteresis_threshold() function - Added the sobel_edge_detector() function - Added the suppress_non_maximum_edges() function - Added the zero_border_pixels() function - Changed the pixel_traits structure so that it can support 8, 16, and 32 bit grayscale pixels.

Non-Backwards Compatible Changes: - Added more fields to the pixel_traits template so if you had defined your own pixel types you will need to update them.

Bug fixes: - Fixed some compiler errors in Visual Studio 2008

Other: - Generally tried to clean up the documentation and code in this release

New Stuff: - Added the randomize_samples() function - Added the set_main_font() and main_font() functions to the drawable object. So now the drawable widgets can use a user provided font.

Non-Backwards Compatible Changes: - Made the named_rectangle object a little easier to use. It now won't let you size it so small that it doesn't display its entire name.

Bug fixes: - Fixed a bug in the svm_nu_train() function that caused a crash with some inputs. - Fixed a compile time error that occurred when compiling the bayesian network code in Mac OS X. - Fixed a bug in the compute_cursor_pos() function where it would return the incorrect value.

Other: - Added an example showing how to use the svm functions.

New Stuff: - Added the left_substr() and right_substr() functions - Added the zero_extend_cast() function - Added the unsigned_type template - Added the uint8 typedef - Bayesian Network related - Added the assignment object - Added the bayes_node object - Added the joint_probability_table object - Added the conditional_probability_table object - Added the bayesian_network_gibbs_sampler object This object implements an algorithm that performs approximate inference in a Bayesian Network. - Added the bayesian_network_join_tree object This object implements an algorithm that performs exact inference in a Bayesian Network. - Set related - Added the set_intersection_size() function - Added the set_union() function - Added the set_intersection() function - Added the set_difference() function - Graph related - Added the graph object - Added the is_graph template - Added the is_directed_graph template - Added the create_moral_graph() function - Added the triangulate_graph_and_find_cliques() function - Added the graph_contains_length_one_cycle() function - Added the find_connected_nodes() function - Added the graph_is_connected() function - Added the is_clique() function - Added the is_maximal_clique() function - Added the copy_graph_structure() function - Added the create_join_tree() function - Added the is_join_tree() function - Added the edge() function - GUI related - Added the base_window::get_display_size() function - Added message_box_blocking() - Added the bdf_font object which is capable of loading BDF font files into the font object used by the gui_widgets - Better Unicode support - Added the basic_utf8_ifstream: An input stream that can read UTF-8 files - Added serialization support for wchar_t and std::wstring - Added the is_combining_char() function - Added the convert_utf8_to_utf32() function - Modified most of the string manipulation functions in dlib/string.h to work with any kind of character type - The gui widgets' font object now works with Unicode text (i.e. wchar_t and unichar strings) as well as with normal char data.

Non-Backwards Compatible Changes: - The dlib/all_console.cpp and dlib/all_gui.cpp files have been deprecated in favor of a new file. Now to build with dlib you simply add dlib/all/source.cpp to your project regardless of what type of project you are building. - The GUI program entry point, winmain(), has been removed. You can now use the normal main() entry point or some other non-standard entry point provided by your compiler. - Renamed directed_graph::node::item to directed_graph::node::data

Bug fixes: - Fixed some build issues in gcc 4.2 involving some uses of the std_allocator - Fixed some build issues in Visual Studio involving the dir_nav component and building with NO_MAKEFILE #defined. - Moved the #define that disables the old WinSock API into the sockets cpp file. This should avoid conflicts with people who are using the old WinSock API. - Changed the tuple template slightly to avoid a bug in Visual Studio 7.1 that caused a compile time error in some instances.

Other:

New Stuff: - Added a destroy() function to the map, set, hash_map, and hash_set objects. - Added the tuple object - Added an overload of connect() that has a timeout - Added rand_kernel_3 as a random number generator that uses the Mersenne Twister algorithm. - Added the directed_graph object - Added the graph_contains_undirected_cycle() and graph_contains_directed_cycle() functions. - Added the std_allocator object. It is a STL style allocator that can use the dlib memory manager objects. - std::string manipulation functions: - Added the cast_to_string() function. - Added the tolower() function - Added the toupper() function - Added the ltrim() function - Added the rtrim() function - Added the trim() function - Added the lpad() function - Added the rpad() function - Added the pad() function

Non-Backwards Compatible Changes: - Changed the default logging level from LNONE to LERROR - Renamed the ASSERT macro to DLIB_ASSERT and CASSERT to DLIB_CASSERT. This rename avoids a conflict with a macro inside MFC. - Changed the logger so that settings are inherited when a new logger is instantiated rather than just having the new logger use the default settings. - Removed the logger::clear() function since it no longer really makes sense given the above change. - Removed the get_main_thread_id() function and replaced it with the is_dlib_thread() function.

Bug fixes: - Pushed some things into cpp files because doing so avoids build and/or runtime errors on some platforms.

Other: - Changed the string_cast() function so that it will recognize the words true and false as boolean values. Also improved the error message inside the string_cast_error exception object.

New Stuff: - Added the covariance() function - Added the rgb_alpha_pixel pixel type and modified all relevant functions to support it.

Non-Backwards Compatible Changes: - The GUI changes that are non-backwards compatible: - The alpha parameter is now an unsigned char instead of unsigned int and its range is now 0 to 255 instead of 0 to 256. - The image_widget no longer has any member functions dealing with alpha values. If you want to use alpha blending you just give it an image that has an alpha channel. The same goes for draw_image(). - There are now more fields in the pixel_traits template. So if you were defining your own pixels before you will need to update your pixel_traits specializations.

Bug fixes: - Made some functions non-inline and put some things on the stack instead of heap. Doing this avoids some problems with certain kinds of builds in visual studio.

Other: - Modified the message_box() function so that it is safe to call end_program() from within its callback event.

New Stuff: - Modified the GUI drawing functions to take an alpha argument to allow alpha blending. - Added the svm_nu_cross_validate() function to perform k-fold cross validation using the svm_nu_train() function. - Added the boost enable_if templates - Added the rand_float extension to the rand object. - New matrix features: - Added the pinv() function - Changed round_zeros() to use the machine epsilon instead of 1e-6 as its default epsilon. - Modified the matrix object so that you can declare them with a static dimension and a dynamic dimension. E.g. matrix<float,0,10> is now legal and declares a matrix with a fixed number of columns(10) and a variable number of rows. - Added the equal() function to compare two matrices of floating point numbers for near equality. - Changed the matrix so that operator(long) works for both column vectors and now also for row vectors. - Added a set_size() and constructor that takes a single long for use in sizing row and column vectors. - Added the scale_columns() function

Non-Backwards Compatible Changes:

Bug fixes: - Fixed an error in svm_nu_train() where it would incorrectly complain of incorrect nu values for some datasets. - Added a missing std:: qualifier at two points in the dlib/vector code that could cause a compiler error in some instances.

Other: - Added a term index to the documentation.

New Stuff: - Added a nu support vector classifier training function. - Added a multilayer neural network object. - Added the "destructive aliasing" checks into the matrix code. Now temporary matrices are only created during assignment if the right hand side aliases the left hand side in a destructive way. This removes many of the previous uses of temporary matrices. - Made the sum() matrix function be able to sum matrices of matrices - New matrix functions: - acos(), asin(), atan(), ceil(), cos(), cosh(), exp(), floor(), log(), log10(), mean(), norm(), pow(), reciprocal(), round_zeros(), sin(), sinh(), sqrt(), tan(), tanh(), variance(), and more overloads of uniform_matrix().

Non-Backwards Compatible Changes:

Bug fixes: - Added missing nr() and nc() functions to the uniform_matrix() and identity_matrix() functions. - Forgot to add a destructor for the dynamically sized matrix resulting in a memory leak. This is now fixed. - Fixed various potential compile time errors

Other:

New Stuff: - Added a copy of the boost noncopyable base class. - added some smart pointers: - added shared_ptr - added weak_ptr - added scoped_ptr

Non-Backwards Compatible Changes:

Bug fixes:

Other: - Cleaned up the assert code and removed the need for the dlib/error.ccp file - Made the matrix take better advantage of the compile time sized dimensions when it can.

New Stuff: - Made it so that command line options have a default conversion to bool and the bool tells you if they are on the command line or not. - Added an implicit conversion to a scalar to the matrix object when it is of dimension 1x1. - Added the thread_function object - Added a function to compute the singular value decomposition of a matrix.

Non-Backwards Compatible Changes: - Added two new arguments to the on_request() function. They allow you to see what HTTP headers the client sends you and to control which ones you send back.

Bug fixes:

Other:

New Stuff: - matrix object additions: - Added some functions to convert between matrix and pixel objects. - Added the clamp() function that operates on matrix objects. - Added the sigmoid function. - Made the matrix object capable of being sized at runtime in addition to its original compile time static sizing capability. - Added 3 and 4 argument versions of pointwise_multiply() - Added the +=, -=, *= and /= operators to the matrix object.

Non-Backwards Compatible Changes:

Bug fixes: - Fixed the line numbering in the color pretty printer. Wasn't being done correctly. - Fixed a bug in the matrix round() function. - Fixed some miscellaneous compile time errors - Fixed a bug in the matrix removerc() function. - Added some missing checks to catch invalid negative index inputs to matrix objects. - Fixed a bug in the matrix inv() function. It could sometimes segfault if used on certain singular matrices

Other: - string_cast() can now convert hex strings to integers - You can now say myarray2d.set_size(0,0) and have it do what you would naturally expect. - Added some #pragma statements that tell visual studio to link the right system libraries automatically. So now you don't have to add these things in the project settings anymore.

New Stuff: - Added the set_all_logging_levels(), set_all_logging_output_streams() functions - Added the configure_loggers_from_file() function which allows you to easily configure all logger objects using a textual configuration file.

Non-Backwards Compatible Changes:

Bug fixes: - Added a workaround into the code that avoids a potential compilation error on Mac OS X systems.

Other:

New Stuff:

Non-Backwards Compatible Changes:

Bug fixes: - Fixed a bug in the POSIX version of the hostname_to_ip() function. It was screwy if you asked for more than the first IP address (the same address might be returned more than once). - Fixed a bug in the pipe object's timeout functions. The timeouts weren't working correctly.

Other:

New Stuff: - Added the wait_for_num_blocked_dequeues(), enable_enqueue(), disable_enqueue(), and is_enqueue_enabled() functions to the pipe object. - The pipe object can now be used with a zero length buffer.

Non-Backwards Compatible Changes: - There is no longer a pipe::kernel_1a_c typedef since the pipe no longer has any requirements to check (due to the change of allowing zero length buffer sizes)

Bug fixes:

Other: - Made the ASSERT and CASSERT macros call dlib_assert_breakpoint() when they fail. This way you can easily set a breakpoint on them in a debugging tool by breaking on calls to this new function. - Fixed some typos and unclear parts of the pipe spec.

New Stuff: - Added a thread safe version of the config_reader object (in the form of an extension to the config_reader) - Added the wait_until_empty() function to the pipe object.

Non-Backwards Compatible Changes: - Removed the connection::close() and listener::close() functions. They have been replaced by destructors. To upgrade old code all you have to do is replace statements of the form "object->close();" with "delete object;". Both statements do exactly the same thing. However, for connection objects, you should probably be using the close_gracefully() function instead.

Bug fixes: - Removed a potential compile time error in the dng image format handling code. - Fixed a bug in the bigint object. The destructor was using "delete" when it should have been using "delete []" - Fixed a resource leak in the POSIX version hostname_to_ip() - Fixed a significant memory leak in memory_manager_kernel_1 - Fixed a memory leak that could occur in memory_manager_kernel_2 and memory_manager_kernel_3 when the constructor for the object being constructed threw an exception. - Added a missing delete statement to plug a memory leak in the md5 computation code. - Fixed an uninitialized variable warning from valgrind (in lz77_buffer/lz77_buffer_kernel_2.h). I think this could also potentially result in an error when decoding data but I'm not totally sure. But either way it is fixed now. - Changed a call to memcpy to memmove in the sockstreambuf_kernel_2 implementation since the copy could potentially be of overlapped memory.

Other: - Changed the connection::read() and connection::write() functions to take longs instead of unsigned longs as the buffer sizes. They also now return longs instead of ints. This should be a backwards compatible change. - Started using the valgrind tool to check for memory errors in the project and found a few things. Very nice tool :)

New Stuff: - Added the multithreaded_object extension to the threads API - Added the load_dng() and save_dng() functions which can load and store the DNG lossless compressed image format (which I just made up).

Non-Backwards Compatible Changes: - Changed the serialization format for bool to use a 1 byte code rather than 2 bytes. So this breaks compatibility with the old format.

Bug fixes: - The serialization for bool didn't always work right. This is now fixed.

Other:

New Stuff: - New faster version of the bigint object (bigint_kernel_2) that uses the Fast Fourier Transform to perform multiplications. - The base_window can now be an "undecorated" window. This new type is suitable for making things like popup menus and the like. - Added the on_focus_lost() event to the base_window object - Added the on_focus_gained() event to the base_window object - Added the on_window_moved() event to the base_window object - Added the get_pos() function to the base_window object - Updated the gui_widgets's drawable interface stuff to support the three new event types and the new window type. - Added the drawable::draw_rectangle() function - Added serialization support for std::complex. - Added the assign_image() function

Non-Backwards Compatible Changes: - Removed the color arguments from the drawable_window object's constructor and added a new boolean argument (if it is an undecorated window or not). This probably won't break any code but if it does you should get a compiler error about it. - Made it so you must disable the events in the destructor for your drawable gui widgets. Doing so avoids potential race conditions when destructing drawable objects. - Made it so that you are required to call close_window() in a window object's destructor. This avoids a potential race condition.

Bug fixes: - Added a workaround for a bug in MinGW that caused the regression test suite to crash when compiled with -O3. - Fixed a potential bug in the X Windows version of the gui_core component. Added an extra XFlush() to end_program() because without it a program can crash when calling end_program() in certain instances. - The spec for the pipe object said that objects you enqueue into it had an "initial value for their type" after the function completes. This is incorrect, they are swapped into the pipe so they have an undefined value afterwards. I fixed the spec for the pipe to say this. - Fixed a bug in the font rendering functions in the gui_widgets component. It could cause a segmentation fault sometimes. - Fixed some potential deadlocks in the windows version of the gui_core component. - Fixed a bug in the rsignaler object. When you called wait() or wait_or_timeout() it only unlocked the associated rmutex once (it could be locked more than once and thus might cause a deadlock since the thread calling wait() wouldn't actually unlock the mutex in this case). - Fixed the initialize_array() function in memory_manger_kernel_3 to be exception safe. Previously if an exception occurred while creating an array then a resource leak was created.

Other: - Changed the package format for the library somewhat. The examples are now located in their own top level folder. Additionally, the HTML version of the documentation also comes in the same archive as the source rather than in a separate download. - Started using major and minor version numbers rather than just major ones.

New Stuff: - Added operator<< and operator>> iostream operators to the vector object.

Non-Backwards Compatible Changes: - Changed the xml_parser's document_handler interface: made empty element tags (<like_this/>) trigger the end_element() callback and removed the is_empty bool from start_element().

Bug fixes: - Fixed a potential race condition between the destruction of the thread pool and the "program ending handlers" stuff.

Other: - Made the xml parser more robust to different types of new line characters. - Modified the source slightly so that it works with mingw.

New Stuff: - The config_reader is now enumerable. - Added the image_widget gui object. - Added nr() and nc() to the array2d object. - Added the shutdown_connection() function to the iostream extension to the server object. - Added the timer_kernel_2 implementation which is a version of the timer object that is more efficient in its allocation of threads. - Added the timeout object. - There is now a CMakeLists.txt file located in the dlib folder. See dlib/examples/CMakeLists.txt and dlib/test/CMakeLists.txt for examples that use CMake to build projects using this library. - Added the register_program_ending_handler() function to the threading API.

Non-Backwards Compatible Changes: - Removed the config_reader::get_blocks() function. Use the new enumerable interface for the config_reader instead. - The array2d object now uses longs instead of unsigned longs to report its dimensions and access its elements. - Added a uint64 to the on_connect() callback in the iostream extension to the server object. - timer::set_delay_time() now throws and timer::start() now may throw std::bad_alloc.

Bug fixes: - Fixed a bug in end_program(). In X Windows it might not cause the program to end right away if it was called from outside the event handling thread. - Fixed a bug in the implementation of the timeout part of the close_gracefully() function.

Other: - The library now works on HP-UX - The regression test suite now has command line arguments that enable tests to send debug messages to a file.

New Stuff: - The http server extension now supports the POST HTTP method. - The attribute list object in the xml_parser is now enumerable. - Added the threaded object extension - Added the uintn.h file which defines fixed sized unsigned integral types.

Non-Backwards Compatible Changes: - Renamed the on_get() callback in the http extension to the server object to on_request() - Removed the network byte order functions from the sockets api. (They are still really there though since they come from actual OS header files. But officially they have been replaced by the byte_orderer component). - Renamed dlib/uint64.h to dlib/uintn.h

Bug fixes:

Other: - The command line parser will now let you declare long named options with - characters in them. - Made it so you can use the COMPILE_TIME_ASSERT macros anywhere rather than just inside functions.

New Stuff: - For dlib::matrix - Added the tmp() function - Added optimized specializations of inv() and det() for 1x1, 2x2, 3x3 and 4x4 matrices. - Added the removerc() function - Sockets related - Added the connect() function - Added the is_ip_address() function. - Added the close_gracefully() function - Added the iostream extension to the server object. - Added the http extension to the server object.

Non-Backwards Compatible Changes: - Changed the cpp_tokenizer to not convert characters to their html form.

Bug fixes: - Removed some potential compile time errors. See the change log for details.

Other: - Improved the web site - Added some more example code - Added more colors to cpp_pretty_printer_kernel_1.
New Stuff: - std::map is now serializable - Added the matrix object and a bunch of supporting code. - Added the list_box graphical widget - Added the fill_rect_with_vertical_gradient() function to the drawable interfaces list of drawing helpers. - Added the open_file_box() function which provides a simple file chooser.

Non-Backwards Compatible Changes:

Bug fixes: - Made timestamper::get_timestamp() be a const function like it should. Fixes some compile errors. - Fixed a bug in the font::draw_string() function. It didn't redraw multi-line strings right. - Fixed a bug in the scroll_bar object that would cause a compile error if you tried to call its width() function. - Fixed a bug in the array_kernel_1 object. It would cause a segmentation fault when used sometimes.

Other:
New Stuff: - Added the following image transformation functions: - Added the equalize_histogram() function - Added the spatially_filter_image() function - Added the threshold_image() function - Added the binary_dilation() function - Added the binary_erosion() function - Added the binary_open() function - Added the binary_close() function - Added the binary_intersection() function - Added the binary_difference() function - Added the binary_complement() function - Added the clear(), load_from() and default constructor back into the config_reader. - Made the member_function_pointer copyable and also added operator== and != to it.

Non-Backwards Compatible Changes: - Made the vector object templated so you can use types other than double with it. But now you have to specify what type you want to use which is slightly different. - The asc_pair_remover and asc_remover abstract classes now take a third template argument. I highly doubt this effects any code outside the library but it is possible.

Bug fixes: - Fixed a bug in the base_window::set_size() function. If you specified a size of (0,0) it caused your program to error out. This has now been fixed. - Fixed a bug in the scroll_bar widget. - Fixed a bug in save_bmp(). For some image sizes it would output a goofy looking skewed image.

Other: - Switched everything that used to call operator< directly to instead use std::less or to take a template argument that provides a compare functor that defaults to std::less.
New Stuff: - Added the assign_pixel() function - Added the hsi pixel type - Added the save_bmp() function - Added the static_switch template

Non-Backwards Compatible Changes: - Changed how the config_reader works. It now has a more powerful syntax and improved interface. Converting any old code to use the new version should be simple since the new file syntax is very nearly backwards compatible with the old syntax. (i.e. You probably won't have to change anything about your config files) - Renamed the dlib/image_loader.h file to dlib/image_io.h since it now includes the image saver stuff. - Renamed the pixel struct to rgb_pixel - Renamed pixel_traits::color to pixel_traits::rgb - Renamed pixel_traits::scalar to pixel_traits::grayscale

Bug fixes: - Fixed a bug in the load_bmp() function. It would load 24bit bmp files incorrectly. - Changed the logger so that it won't deadlock if you write something similar to my_log << LINFO << function_that_also_logs();. Although this is a dumb thing to do. But even so, it shouldn't deadlock. - Fixed a potential linking problem with the vector object.

Other: - I decided I'm not going to support Borland v5.5.1 anymore. There are just too many bugs in this compiler. It is very old at this point so I don't see this being a big deal. - Made the drawable::draw_image() and load_bmp() functions able to handle images of any type of pixel. - Pulled the imaging, algorithmic and metaprogramming stuff out of the miscellaneous section of the web page and gave them all their own sections.
New Stuff: - Added a logger header that prints the date and time. - Added the LTRACE logging level - Added a buffered implementation of sockstreambuf.

Non-Backwards Compatible Changes: - Changed the specs to say that sockstreambuf may be buffered. sockstreambuf_kernel_1 is still just as it always has been though. So all old code will still work just as it always has. But all the same, the specs have been changed and now allow for an implementation that is not 100% backwards compatible. - rand_kernel_2 now emits a different string of random numbers.

Bug fixes: - Changed the logger object's implementation to not try to register a thread end handler for the main program thread anymore. This was technically a bug according to the spec but it actually did end up working the way it was supposed to. But even so, it shouldn't have been doing that. - Changed binary_search_tree_kernel_1 so that it avoids a bug in the version of gcc on SuSE Enterprise Linux 9. - Fixed a bug in the rand_kernel_2 implementation. It wasn't giving good random numbers.

Other: - Modified the code so that you don't get any warnings when -Wall is used with GCC.
New Stuff: - Added the ASSERT_ARE_SAME_TYPE macro - Added the is_same_type template - Added the get_main_thread_id() function to the threading API - Added the thread_specific_data extension to the threading API - Added the logger object. - Added the auto_unlock object to the threading API.

Non-Backwards Compatible Changes:

Bug fixes:

Other: - Added an example that is specifically about using threads - Added two examples about using the logger object
New Stuff: - Added the memory_manager_stateless object and two implementations of it. - Added the MACOSX macro to dlib/platform.h - Added a templated version of create_new_thread() that allow you to start a thread with a member function. - Added the register_thread_end_handler() function to the threading kernel API. - Added memory_manager_kernel_3

Non-Backwards Compatible Changes: - Changed the meaning of the memory_manager_global::get_number_of_allocations() function because the previous definition of it didn't really make sense for this object. - Changed the threading API to wait for all outstanding threads to terminate before allowing the program to end. It used to just let the OS trash those threads when main() ended but this isn't a safe or portable thing to do. I used to assume the user would make sure all their threads were done and had cleaned up whatever they were doing before main() ended but this is too much of a burden on the end user. So now the library will wait for your threads to end. You still need to have some way of telling them it is time to stop though.

Bug fixes: - Fixed a minor bug in dlib/timer/timer_kernel_1.h. Its implementation was slightly off according to the specification of a timer object.

Other: - The byte_order object is now capable of flipping entire arrays. - Made it so that the ENABLE_ASSERTS macro is defined whenever ASSERT is on. - Made the array container use the memory managers.

New Stuff: - Added functions to explicitly convert to/from little and big endian to the byte_order object. - Added the allocate_array() and deallocate_array() functions to the memory_manager. - Created the memory_manager_global object - Added the remove_last_in_order(), position_enumerator() and remove_current_element() functions to the binary_search_tree object.

Non-Backwards Compatible Changes: - I put an #error directive in the old GUI component to notify anyone trying to use it that it is deprecated. I will be removing it from the library in a few months. - Switched the reference_counter object back to not using the memory_manager. I realized it isn't safe for this object to use the memory_manager since it could result in memory_managers freeing each other's allocations. - I redefined the pixel_traits template. It is now a lot simpler and more convenient.

Bug fixes: - Fixed a minor bug in dlib/rand/rand_kernel_2.cpp

Other: - Added some more compile time checks to the byte_orderer object. - Changed some includes and preprocessor macros around a little so now everything but the GUI stuff compiles in mac OS X. - Added inclusion guards to all the .cpp files - Added the all_gui.cpp and all_console.cpp files. They include all the .cpp files you need to make gui and console applications respectively into one file. - Made more containers use the memory_manager.

New Stuff: - Added the enqueue_or_timeout() and dequeue_or_timeout() functions to the pipe object. - Gave the mouse_tracker the ability to display the mouse position relative to a user selected point. - Added the message_box() function to the gui_widgets component. - Gave the label widget the ability to draw newlines in strings. - added the close_window() and is_closed() methods to the base_window object. - Added the rsignaler extension to the threading API. - You can now control the thread pool timeout time by setting the DLIB_THREAD_POOL_TIMEOUT #define. - Added the get_from_clipboard() and put_on_clipboard() functions to the gui_core component. - Added the stop_and_wait() function to the timer object. - Added the trigger_user_event() function and on_user_event() event to the base_window object. This new event is also forwarded to drawable interfaces inside the receiving window. - Added the wrap_around() function to the named_rectangle widget. - Added the top(), left(), right(), bottom(), width() and height() functions to the drawable interface.

Non-Backwards Compatible Changes: - Made the radio_button and check_box widgets pass references to themselves when they call their click handlers. - Switched the sync_extension to use the rmutex and rsignaler objects rather than the normal non-reentrant ones. ( Chances are that old code that used this will still compile fine anyway. ) - Changed the return type of rand::get_random_number() to be an unsigned char. I also changed both the implementations of rand because they weren't very good at all. - Changed the functions related to drawing strings in the font class. - Changed the drawable's rectangle to default to being empty rather than being a single point. Most code should not notice the difference.

Bug fixes: - The event handlers in gui_widgets/drawable.h were private. They should be protected. This is now fixed. - Fixed a bug in the way the scroll_bar was drawn when it was the HORIZONTAL type. - Changed how the thread pool destructs itself when the program is ending. Previously it was possible to get an error on NetBSD when the program was ending. This is now fixed. - The functions related to setting the jump size in the scroll_bar widget were private. They are now public. - There was a bug in the MS Windows version of the gui_core component where the members of the base_window would not work if called from within the on_window_close() event. This has now been fixed. - Made the set_pos() function work right for the mouse_tracker widget. - Fixed a bug in the base64 object where the string "" could potentially be decoded incorrectly. - Made the global swap function for crc32_kernel_1 inline. This fixes a potential linker error. - Fixed some potential deadlocking that could occur while using the gui widgets.

Other: - I moved all the regression tests into the dlib/test folder and made a nice driver program to run all of them. - I have been using the sourceforge compile farms to test the library on various platforms. It now works for Solaris and some of the BSDs in addition to Linux and Windows.
New Stuff: - Added the array_expand extension to the array object. - Added the cmd_line_parser_check extension to the command line parser. - Added the pipe object. - All applicable container classes now use the memory_manager component for their memory allocation. - New implementations of the memory_manager object. - Added the copy_functor class.

Non-Backwards Compatible Changes: - Moved the wrap_string, narrow, and string_cast functions to a new file. You now have to include dlib/string.h to get them. (This makes a bunch of other things work right in gcc 2.95) - Renamed the _L macro to _dT - Removed the scopy class - Simplified the interface to the memory manager. It is basically the same though. - Removed the max_size() methods from the hash_table and binary_search_tree objects. - Removed the T_is_POD template arguments from the hash_table and binary_search_tree objects. - Simplified the template arguments to all checking components and extensions. They now take the class they are to extend or check as their only template argument. This only affects you if you haven't been using the kernel_nx typedefs.

Bug fixes:

Other: - I changed a few things around and now a majority of the library again compiles under gcc 2.95. But some things don't and I currently don't plan on making them work because it involves hackish workarounds of 2.95's bugs. - Changed the compress_stream_kernel_1 object so that it will detect data corruptions better. This change will prevent it from correctly decompressing data that was compressed with a previous version and has an uncompressed size greater than about 20,000 bytes. - There is a new cpp file you need to compile: dlib/error.cpp - Moved all the regression testing stuff into the dlib/test folder and made a nicer test driver to run them.
New Stuff: - Created the byte_orderer object. - Created the mouse_tracker gui widget. - The sliding_buffer object is now enumerable and serializable. - Added the get_filesystem_roots() function to the dir_nar component. - Added the create_directory() function to the misc_api component.

Non-Backwards Compatible Changes: - The ASSERT macro is now only enabled if DEBUG or ENABLE_ASSERTS is defined.

Bug fixes: - Fixed a minor bug in the cmd_line_parser object. If you gave an option such as --option=arg when option didn't take any arguments it could hang your program. - Fixed a bug in wait_or_timeout() in the posix version of the threading api. The time to wait for was being calculated incorrectly and could result in an excessive number of spurious returns. - Fixed a minor bug in the on_keydown() event for windows. I had it set such that the shift and ctrl bools would be false if they were the actual keys being pressed. This isn't what the specs say should happen but I had a comment in the windows code that made it clear that I did it on purpose. Go figure :) This is now fixed.

Other: - Improved the cpp_tokenizer object's ability to recognize numerical constants. - Improved the text_field gui widget. - There are now two assert macros. One called ASSERT and another CASSERT. They both do the same thing but ASSERT is only enabled when DEBUG or ENABLE_ASSERTS is defined. All the old ASSERT statements were changed to CASSERT statements.
New Stuff: - Added array_kernel_2 which is a simple layer on top of a C array. - Added the tabbed_display GUI widget - Added the widget_group GUI widget - Added the named_rectangle GUI widget - Added the pixel_traits template

Non-Backwards Compatible Changes: - The default maximum size for an array object is now 0 rather than 20,000. Bug fixes:

Other: - made the cpp_pretty_printer a little better about how it handles C style code. Also added support for /*!A html_anchor_name !*/ style comments.
New Stuff: - Created the array2d object. - Created the base64 object. - Created the pixel struct. - Created the load_bmp() function which can load a BMP image file into an array2d object of pixels. - Created the drawable::draw_image() function

Non-Backwards Compatible Changes: - In the drawable interface I made the z order a long rather than unsigned long. - The cpp_tokenizer object now has a NUMBER token type. - removed the get_ prefix from functions in the cmd_line_parser and cmd_line_parser_option objects. Also changed the cmd_line_parser_option::operator[] function to a normal member function called argument().

Bug fixes:

Other: - cpp_pretty_printer now colors numeric literals a shade of yellow.
New Stuff: - Created the member_function_pointer object. - Created the button_action object. - Created the arrow_button object. - Created the check_box object. - Created the radio_button object. - Created the scroll_bar object. - More drawing functions to draw various things onto a canvas object. - Added enable/disable functions to the drawable interface.

Non-Backwards Compatible Changes: - The gui widgets are no longer templated at the class level. - The drawable object's constructor now takes a bit set rather than a bunch of bools to tell it which events to enable. - I changed the names of some of the functions in the gui_widgets component so that they all reflected a uniform naming style.

Bug fixes: - Fixed a minor bug in the cpp_tokenizer. - Minor bug in the timer object. See change log for details.

Other: - Made the timer object a little more robust