182 lines
14 KiB
HTML
182 lines
14 KiB
HTML
<html>
|
||
<head>
|
||
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
|
||
<title>Chapter 1. Boost.NumericConversion</title>
|
||
<link rel="stylesheet" href="boostbook.css" type="text/css">
|
||
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
|
||
<link rel="home" href="index.html" title="Chapter 1. Boost.NumericConversion">
|
||
<link rel="next" href="boost_numericconversion/definitions.html" title="Definitions">
|
||
</head>
|
||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||
<table cellpadding="2" width="100%"><tr>
|
||
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td>
|
||
<td align="center"><a href="../../../../../index.html">Home</a></td>
|
||
<td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td>
|
||
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
|
||
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
|
||
<td align="center"><a href="../../../../../more/index.htm">More</a></td>
|
||
</tr></table>
|
||
<hr>
|
||
<div class="spirit-nav"><a accesskey="n" href="boost_numericconversion/definitions.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a></div>
|
||
<div class="chapter">
|
||
<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">
|
||
<a name="numeric_conversion.legal"></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 class="toc">
|
||
<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>
|
||
<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.udts_with_numeric_cast">UDTs
|
||
with numeric_cast</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__.numeric_cast_traits">numeric_cast_traits</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">
|
||
<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" style="list-style-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: April 13, 2021 at 16:26:20 GMT</small></p></td>
|
||
<td align="right"><div class="copyright-footer"></div></td>
|
||
</tr></table>
|
||
<hr>
|
||
<div class="spirit-nav"><a accesskey="n" href="boost_numericconversion/definitions.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a></div>
|
||
</body>
|
||
</html>
|