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