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| <div class="chapter" title="Chapter 1. Boost.NumericConversion"> |
| <div class="titlepage"><div> |
| <div><h2 class="title"> |
| <a name="numeric_conversion"></a>Chapter 1. Boost.NumericConversion</h2></div> |
| <div><div class="author"><h3 class="author"> |
| <span class="firstname">Fernando Luis</span> <span class="surname">Cacciola Carballal</span> |
| </h3></div></div> |
| <div><p class="copyright">Copyright © 2004 -2007 Fernando Luis Cacciola Carballal</p></div> |
| <div><div class="legalnotice" title="Legal Notice"> |
| <a name="id553943"></a><p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
| </p> |
| </div></div> |
| </div></div> |
| <div class="toc"> |
| <p><b>Table of Contents</b></p> |
| <dl> |
| <dt><span class="section"><a href="index.html#numeric_conversion.overview">Overview</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html">Definitions</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.introduction">Introduction</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.types_and_values">Types |
| and Values</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.c___arithmetic_types">C++ |
| Arithmetic Types</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.numeric_types">Numeric |
| Types</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.range_and_precision">Range |
| and Precision</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.exact__correctly_rounded_and_out_of_range_representations">Exact, |
| Correctly Rounded and Out-Of-Range Representations</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.standard__numeric__conversions">Standard |
| (numeric) Conversions</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.subranged_conversion_direction__subtype_and_supertype">Subranged |
| Conversion Direction, Subtype and Supertype</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="boost_numericconversion/converter___function_object.html">converter<> |
| function object</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/converter___function_object.html#boost_numericconversion.converter___function_object.synopsis">Synopsis</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/converter___function_object.html#boost_numericconversion.converter___function_object.template_parameters">Template |
| parameters</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/converter___function_object.html#boost_numericconversion.converter___function_object.member_functions">Member |
| functions</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/converter___function_object.html#boost_numericconversion.converter___function_object.range_checking_logic">Range |
| Checking Logic</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/converter___function_object.html#boost_numericconversion.converter___function_object.examples">Examples</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="boost_numericconversion/type_requirements_and_user_defined_types_support.html">Type |
| Requirements and User-defined-types support</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/type_requirements_and_user_defined_types_support.html#boost_numericconversion.type_requirements_and_user_defined_types_support.type_requirements">Type |
| Requirements</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/type_requirements_and_user_defined_types_support.html#boost_numericconversion.type_requirements_and_user_defined_types_support.udt_s_special_semantics">UDT's |
| special semantics</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/type_requirements_and_user_defined_types_support.html#boost_numericconversion.type_requirements_and_user_defined_types_support.special_policies">Special |
| Policies</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="boost_numericconversion/bounds___traits_class.html">bounds<> |
| traits class</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/bounds___traits_class.html#boost_numericconversion.bounds___traits_class.introduction">Introduction</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/bounds___traits_class.html#boost_numericconversion.bounds___traits_class.traits_class_bounds_n_">traits |
| class bounds<N></a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/bounds___traits_class.html#boost_numericconversion.bounds___traits_class.examples">Examples</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="boost_numericconversion/conversion_traits___traits_class.html">conversion_traits<> |
| traits class</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types">Types</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.examples">Examples</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="boost_numericconversion/numeric_converter_policy_classes.html">Numeric |
| Converter Policy Classes</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.enum_range_check_result">enum |
| range_check_result</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_overflowhandler">Policy |
| OverflowHandler</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_float2introunder">Policy |
| Float2IntRounder</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_rawconverter">Policy |
| RawConverter</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_userrangechecker">Policy |
| UserRangeChecker</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="boost_numericconversion/improved_numeric_cast__.html">Improved |
| numeric_cast<></a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="boost_numericconversion/improved_numeric_cast__.html#boost_numericconversion.improved_numeric_cast__.introduction">Introduction</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/improved_numeric_cast__.html#boost_numericconversion.improved_numeric_cast__.numeric_cast">numeric_cast</a></span></dt> |
| <dt><span class="section"><a href="boost_numericconversion/improved_numeric_cast__.html#boost_numericconversion.improved_numeric_cast__.examples">Examples</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="numeric_conversion/history_and_acknowledgments.html">History |
| and Acknowledgments</a></span></dt> |
| <dt><span class="section"><a href="numeric_conversion/bibliography.html">Bibliography</a></span></dt> |
| </dl> |
| </div> |
| <div class="section" title="Overview"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="numeric_conversion.overview"></a><a class="link" href="index.html#numeric_conversion.overview" title="Overview">Overview</a> |
| </h2></div></div></div> |
| <p> |
| The Boost Numeric Conversion library is a collection of tools to describe and |
| perform conversions between values of different <a class="link" href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.numeric_types" title="Numeric Types">numeric |
| types</a>. |
| </p> |
| <p> |
| The library includes a special alternative for a subset of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special"><></span></code>, the <a class="link" href="boost_numericconversion/bounds___traits_class.html" title="bounds<> traits class">bounds<></a> |
| traits class, which provides a consistent way to obtain the <a class="link" href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.range_and_precision" title="Range and Precision">boundary</a> |
| values for the <a class="link" href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.range_and_precision" title="Range and Precision">range</a> |
| of a numeric type. |
| </p> |
| <p> |
| It also includes a set of <a class="link" href="boost_numericconversion/conversion_traits___traits_class.html" title="conversion_traits<> traits class">trait |
| classes</a> which describes the compile-time properties of a conversion |
| from a source to a target numeric type. Both <a class="link" href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.c___arithmetic_types" title="C++ Arithmetic Types">arithmetic</a> |
| and <a class="link" href="boost_numericconversion/definitions.html#boost_numericconversion.definitions.numeric_types" title="Numeric Types">user-defined |
| numeric types</a> can be used. |
| </p> |
| <p> |
| A policy-based <a class="link" href="boost_numericconversion/converter___function_object.html" title="converter<> function object">converter</a> |
| object which uses <code class="computeroutput"><span class="identifier">conversion_traits</span></code> |
| to select an optimized implementation is supplied. Such implementation uses |
| an optimal range checking code suitable for the source/target combination. |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| The converter's out-of-range behavior can be customized via an <a class="link" href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_overflowhandler" title="Policy OverflowHandler">OverflowHandler</a> |
| policy. |
| </li> |
| <li class="listitem"> |
| For floating-point to integral conversions, the rounding mode can be selected |
| via the <a class="link" href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_float2introunder" title="Policy Float2IntRounder">Float2IntRounder</a> |
| policy. |
| </li> |
| <li class="listitem"> |
| A custom low-level conversion routine (for UDTs for instance) can be passed |
| via a <a class="link" href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_rawconverter" title="Policy RawConverter">RawConverter</a> |
| policy. |
| </li> |
| <li class="listitem"> |
| The optimized automatic range-checking logic can be overridden via a <a class="link" href="boost_numericconversion/numeric_converter_policy_classes.html#boost_numericconversion.numeric_converter_policy_classes.policy_userrangechecker" title="Policy UserRangeChecker">UserRangeChecker</a> |
| policy. |
| </li> |
| </ul></div> |
| </div> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"><p><small>Last revised: November 20, 2009 at 09:59:43 GMT</small></p></td> |
| <td align="right"><div class="copyright-footer"></div></td> |
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