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- [library Boost.NumericConversion
- [quickbook 1.4]
- [authors [Cacciola Carballal, Fernando Luis]]
- [copyright 2004-2007 Fernando Luis Cacciola Carballal]
- [category numerics]
- [id numeric_conversion]
- [dirname numeric_conversion]
- [purpose
- Optimized Policy-based Numeric Conversions
- ]
- [source-mode c++]
- [license
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE_1_0.txt or copy at
- [@http://www.boost.org/LICENSE_1_0.txt])
- ]
- ]
- [/ Macros will be used for links so we have a central place to change them ]
- [/ Cited Boost resources ]
- [def __MPL_INTEGRAL_CONSTANT__ [@../../../../mpl/doc/refmanual/integral-constant.html MPL's Integral Constant] ]
- [/ Other web resources ]
- [def __SGI_UNARY_FUNCTION__ [@http://www.sgi.com/tech/stl/UnaryFunction.html Unary Function Object]]
- [/ Icons ]
- [def __NOTE__ [$images/note.png]]
- [def __ALERT__ [$images/caution.png]]
- [def __DETAIL__ [$images/note.png]]
- [def __TIP__ [$images/tip.png]]
- [def __QUESTION_MARK__ [$images/question.png]]
- [def __SPACE__ [$images/space.png]]
- [def __GO_TO__ [$images/callouts/R.png]]
- [section Overview]
- The Boost Numeric Conversion library is a collection of tools to describe and
- perform conversions between values of different
- [link boost_numericconversion.definitions.numeric_types numeric types].
- The library includes a special alternative for a subset of `std::numeric_limits<>`,
- the [link boost_numericconversion.bounds___traits_class bounds<>] traits class, which provides
- a consistent way to obtain the [link boost_numericconversion.definitions.range_and_precision boundary]
- values for the [link boost_numericconversion.definitions.range_and_precision range] of a numeric type.
- It also includes a set of [link boost_numericconversion.conversion_traits___traits_class trait classes]
- which describes the compile-time
- properties of a conversion from a source to a target numeric type.
- Both [link boost_numericconversion.definitions.c___arithmetic_types arithmetic] and
- [link boost_numericconversion.definitions.numeric_types user-defined numeric types] can be used.
- A policy-based [link boost_numericconversion.converter___function_object converter] object which
- uses `conversion_traits` to select
- an optimized implementation is supplied. Such implementation uses an optimal
- range checking code suitable for the source/target combination.
- * The converter's out-of-range behavior can be customized via an
- [link boost_numericconversion.numeric_converter_policy_classes.policy_overflowhandler OverflowHandler] policy.
- * For floating-point to integral conversions, the rounding mode can be selected via the
- [link boost_numericconversion.numeric_converter_policy_classes.policy_float2introunder Float2IntRounder] policy.
- * A custom low-level conversion routine (for UDTs for instance) can be passed via a
- [link boost_numericconversion.numeric_converter_policy_classes.policy_rawconverter RawConverter] policy.
- * The optimized automatic range-checking logic can be overridden via a
- [link boost_numericconversion.numeric_converter_policy_classes.policy_userrangechecker UserRangeChecker] policy.
- [endsect]
- [include definitions.qbk]
- [include converter.qbk]
- [include requirements.qbk]
- [include bounds.qbk]
- [include conversion_traits.qbk]
- [include converter_policies.qbk]
- [include numeric_cast.qbk]
- [section History and Acknowledgments]
- [heading Pre-formal review]
- * Kevlin Henney, with help from David Abrahams and Beman Dawes, originally contributed
- the previous version of `numeric_cast<>` which already presented the idea of a runtime
- range check.
- * Later, Eric Ford, Kevin Lynch and the author spotted some genericity problems with
- that `numeric_cast<>` which prevented it from being used in a generic layer of math
- functions.
- * An improved `numeric_cast<>` which properly handled all combinations of arithmetic
- types was presented.
- * David Abrahams and Beman Dawes acknowledged the need of an improved version of
- `numeric_cast<>` and supported the submission as originally laid out. Daryl Walker and
- Darin Adler made some important comments and proposed fixes to the original submission.
- * Special thanks go to Björn Karlsoon who helped the author considerably. Having found the
- problems with `numeric_cast<>` himself, he revised very carefully the original submission
- and spot a subtle bug in the range checking implementation. He also wrote part of
- this documentation and proof-read and corrected other parts. And most importantly:
- the features now presented here in this library evolved from the original submission as
- a result of the useful private communications between Björn and the author.
- [heading Post-formal review]
- * Guillaume Melquiond spoted some documentation and code issues, particularly about
- rounding conversions.
- * The following people contributed an important review of the design, documentation and c
- ode: Kevin Lynch, Thorsten Ottosen, Paul Bristow, Daryle Walker, Jhon Torjo, Eric Ford,
- Gennadiy Rozental.
- [endsect]
- [section Bibliography]
- * Standard Documents:
- # ISO/IEC 14882:98 (C++98 Standard)
- # ISO/IEC 9899:1999 (C99 Standard)
- # ISO/IEC 10967-1 (Language Independent Arithmetic (LIA), Part I, 1994)
- # ISO/IEC 2382-1:1993 (Information Technology - Vocabulary - Part I: Fundamental Terms)
- # ANSI/IEEE 754-1985 [and IEC 60559:1989] (Binary floating-point)
- # ANSI/IEEE 854-1988 (Radix Independent floating-point)
- # ANSI X3/TR-1-82 (Dictionary for Information Processing Systems)
- # ISO/IEC JTC1/SC22/WG14/N753 C9X Revision Proposal: LIA-1 Binding: Rationale
- * Papers:
- # David Goldberg What Every Computer Scientist Should Know About Floating-Point Arithmetic
- # Prof. William Kahan papers on floating-point.
- [endsect]
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