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- [/
- Copyright Hans Dembinski 2018 - 2019.
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE_1_0.txt or copy at
- https://www.boost.org/LICENSE_1_0.txt)
- ]
- [section:history Revision history]
- [heading Boost 1.72]
- * New features
- * Better deduction guides for axis types and histogram type on C++17 compilers
- * performance improvements in the indexing code
- * new histogram::fill method for accelerated filling from chunks of values
- * ASCII bar charts for 1D histograms when boost/histogram/ostream.hpp is included (contributed by Przemyslaw Bartosik)
- * Passing invalid axis options causes user-friendly compile-time errors
- * Wrong usage of weight() and sample() causes user-friendly compile-time errors
- * algorithm::empty returns true if all histogram values are equal to the default value (contributed by Henry Schreiner)
- * algorithm::reduce with shrink is now well defined when values are not bin edges
- * axis::traits::rank returns the number of values that this axis accepts
- * axis::traits::is_continuous returns whether an axis is continuous or discrete
- * axis::traits::is_inclusive returns whether an axis has a bin for any possible input
- * limited weight support for mean accumulator
- * accumulators::weighted_mean::sum_of_weights_squared method added
- * Fixes
- * Support of -std=c++2a and -stdlib=libc++ on clang, compatibility with gcc-9
- * Fixed: weight could be passed instead of a sample during filling without triggering an error
- * Fixed: segfault when too many indices were passed to algorithm::project
- * Fixed: indexed range generator did not work with storage based on std::array
- * Fixed: weighted_mean() + weighted_mean() != weighted_mean() (discovered and reported by Henry Schreiner)
- * Fixed: axis::option::test(...) returned true if any bits in the test mask were set (now returns true if all bits in the test mask are set)
- * Protecting calls to min, max with against macro expansion
- * Replaced all crlf with lf in concepts.qbk
- * Missing throw of std::invalid_argument when user passes too many axes to histogram
- * Corrected documentation of serialization support in concepts section
- * Resolved warnings for various compiler versions
- * Other
- * Added Boost.Histogram logo
- * Added missing copyright notices
- * axis::category::value returns copy for scalar types and const reference otherwise
- * std::ostringstream not used anymore to generate exception messages to reduces code bloat
- * Documentation improvements
- * Restructured overview section in documentation
- * Updated user guide to demonstrate new features
- * Updated accumulator examples
- * Concepts explain how accumulators can optionally accept weights
- * Updated benchmark code
- * New test checks consistency of b2 and cmake build systems
- * New test checks One-Definition-Rule (fails if non-templated function is not declared inline)
- * Serialization code decoupled from Boost.Serialization
- * Removed dependency on Boost.CallableTraits
- [heading Boost 1.71]
- * New features
- * Thread-safe accumulators boost::histogram::accumulators::thread_safe based on std::atomics
- * Support for thread-safe storages
- * Support for compiling without exceptions/RTTI (increases performance by 10-20 %) [with contributions from Glen Fernandez]
- * Performance improvements for 1D and 2D histograms
- * boost::histogram::indexed now returns forward iterator range instead of input iterator range
- * boost::histogram::indexed_range::accessor is now non-copyable and acts like reference to cell value, making most algorithms from the stdlib work
- * boost::histogram::algorithm::reduce
- * New slice option
- * Fuse shrink, slice, and rebin options passed for the same axis
- * Support histograms with some axis types with reduction support
- * boost::histogram::algorithm::project accepts runtime indices for static histograms
- * Fixes
- * boost::histogram::algorithm::reduce also works on histograms that have some axis types without reduction support
- * boost::histogram::axis::traits::update now works correctly for boost::histogram::axis::variant
- * Other
- * 100 % test coverage
- * Drastically reduced internal Boost dependencies
- * Improved documentation and examples
- * Internally replaced boost::variant with boost::variant2
- * boost::histogram::axis::traits::is_reducible detects reducible axis types
- * Cleanup and refactoring of internals
- * Guarantee no-throw moves for all builtin axis types
- * Improved internal benchmarks
- * Compile cleanly at higher warning levels
- [heading Boost 1.70]
- First Boost release, version 4.0 in former internal counting.
- * Removed Python bindings, will be developed in separate repository
- * All axes can be made optionally circular, except category axis
- * All axes now support generic attached metadata
- * All axes have now independently configurable underflow/overflow extra bins
- * Removed circular axis (which is just a circular regular axis)
- * Added indexed adaptor generator for convenient and fast iteration over histograms
- * Support for axes that can grow in range
- * Support for axes which accept multiple values (example: hexagonal binning)
- * Support for profiles and more generally, arbitrary accumulators in each cell
- * Support for serializing to xml archives
- * Added compatibility with Boost.Range, Boost.Units, and Boost.Accumulators
- * Added deduction guides for axis types and histogram
- * Performance improvements
- * Renamed `adaptive_storage` to `unlimited_storage`
- * Replaced `boost::multiprecision::cpp_int` with custom type to decouple libraries
- * Internal simplification of `axis::variant`
- * Make all storages behave more like containers, simplifying the design
- * Histograms supports add, sub, mul, div
- * replaced `operator[]` in axis with explicit method `bin`
- * replaced `operator()` in axis with explicit method `index`
- * replaced internal use of `boost::containers` with stdlib containers
- * Much improved docs, reference documentation, user guide, more examples
- [heading 3.2 (not in Boost)]
- * Allocator support everywhere
- * Internal refactoring
- [heading 3.1 (not in Boost)]
- * Renamed `bincount` method to `size`
- * Support for axes with only overflow and no underflow bin
- * category axis now by default has bin for "other" input that does not fall
- into the predefined categories, making it consistent with other axes
- * NaN is now consistently put into overflow bin for all axes
- * Eliminated warnings about safe internal conversions on MSVC
- * Established a cpp house style with corresponding .clang-format file
- * Better detection of Python library on all systems
- * Improved code coverage by testing more input errors
- * Raise ValueError instead of generic RuntimeError in Python on input errors
- [heading 3.0 (not in Boost)]
- * Support for efficient adding of multiple histograms and scaling
- * Re-design of category axis as a general mapping between unique values and bins
- * Re-design of the bin description an axis returns upon element access
- * Interface cleanup and simplification, more consistency between Python and C++ interface
- * Iterators for histogram and axes for STL compatibility
- * Regular axis in C++: Allowing transforms with state
- * Regular axis in Python: Support for all C++ transforms
- * Polymorphic axis::any type
- * Internal refactoring from boost::mpl and boost::fusion to std::tuple and boost::mp11
- * Windows support
- [heading 2.0 (not in Boost)]
- * Added static_histogram (v1.0 only had dynamic_histogram).
- * Merged wfill(...) and fill(...) interface.
- * Support custom allocators in storage classes.
- * Replaced static_storage with array_storage.
- * Replaced dynamic_storage with unlimited_storage, which adds the capability to grow the bin counter into a cpp_int, thus avoiding integer overflow completely.
- * Serialization uses binary_archive instead of text_archive. The latter is portable, but the performance is terrible.
- * Python interface changed: histograms are now iterable, returning axis classes
- * Support reduction (removing a subset of axes and returning the equivalent histogram; in other words, those axes are integrated over)
- [heading 1.0 (not in Boost)]
- * First stable version.
- [endsect]
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