3rdparty/boost_1_81_0/doc/html/conversion.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Chapter 9. The Conversion Library 1.7</title>
<link rel="stylesheet" href="../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
<link rel="up" href="libraries.html" title="Part I. The Boost C++ Libraries (BoostBook Subset)">
<link rel="prev" href="container/release_notes.html" title="Release Notes">
<link rel="next" href="conversion/polymorphic_casts.html" title="Polymorphic casts">
</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="p" href="container/release_notes.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="libraries.html"><img src="../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="conversion/polymorphic_casts.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="conversion"></a>Chapter 9. The Conversion Library 1.7</h2></div>
<div><div class="authorgroup">
<div class="author"><h3 class="author">
<span class="firstname">Bjarne</span> <span class="surname">Stroustrup</span>
</h3></div>
<div class="author"><h3 class="author">
<span class="firstname">Dave</span> <span class="surname">Abrahams</span>
</h3></div>
<div class="author"><h3 class="author">
<span class="firstname">Boris</span> <span class="surname">Rasin</span>
</h3></div>
<div class="author"><h3 class="author">
<span class="firstname">Antony</span> <span class="surname">Polukhin</span>
</h3></div>
</div></div>
<div><p class="copyright">Copyright © 2001 Beman Dawes</p></div>
<div><p class="copyright">Copyright © 2014-2022 Antony
      Polukhin</p></div>
<div><div class="legalnotice">
<a name="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="conversion.html#conversion.description">Description</a></span></dt>
<dt><span class="section"><a href="conversion/polymorphic_casts.html">Polymorphic casts</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="conversion/polymorphic_casts.html#conversion.polymorphic_casts.polymorphic_downcast">polymorphic_downcast</a></span></dt>
<dt><span class="section"><a href="conversion/polymorphic_casts.html#conversion.polymorphic_casts.polymorphic_cast">polymorphic_cast</a></span></dt>
<dt><span class="section"><a href="conversion/polymorphic_casts.html#conversion.polymorphic_casts.polymorphic_pointer_cast">polymorphic_pointer_cast</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="conversion/synopsis.html">Synopsis</a></span></dt>
<dt><span class="section"><a href="conversion/history.html">History</a></span></dt>
</dl>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="conversion.description"></a><a class="link" href="conversion.html#conversion.description" title="Description">Description</a>
</h2></div></div></div>
<p>
      The Conversion Library improves program safety and clarity by performing otherwise
      messy conversions. It includes cast-style function templates designed to complement
      the C++ Standard's built-in casts.
    </p>
<p>
      To reduce coupling, particularly to standard library IOStreams, the Boost Conversion
      Library is supplied by several headers:
    </p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
          The <a href="../../boost/polymorphic_cast.hpp" target="_top">boost/polymorphic_cast.hpp</a>
          header provides <a class="link" href="conversion/polymorphic_casts.html#polymorphic_cast"><code class="computeroutput"><span class="identifier">polymorphic_cast</span><span class="special">&lt;&gt;</span></code></a> and <a class="link" href="conversion/polymorphic_casts.html#polymorphic_downcast"><code class="computeroutput"><span class="identifier">polymorphic_downcast</span><span class="special">&lt;&gt;</span></code></a>
          to perform safe casting between polymorphic types.
        </li>
<li class="listitem">
          The <a href="../../boost/polymorphic_pointer_cast.hpp" target="_top">boost/polymorphic_pointer_cast.hpp</a>
          header provides <a class="link" href="conversion/polymorphic_casts.html#polymorphic_pointer_cast"><code class="computeroutput"><span class="identifier">polymorphic_pointer_cast</span><span class="special">&lt;&gt;</span></code></a>
          and <a class="link" href="conversion/polymorphic_casts.html#polymorphic_pointer_cast"><code class="computeroutput"><span class="identifier">polymorphic_pointer_downcast</span><span class="special">&lt;&gt;</span></code></a>
        </li>
<li class="listitem">
          The <a href="../../boost/implicit_cast.hpp" target="_top">boost/implicit_cast.hpp</a>
          header provides <code class="computeroutput"><span class="identifier">implicit_cast</span><span class="special">&lt;&gt;</span></code> to perform implicit casts only
          (no down-cast, no void*-&gt;T*, no U-&gt;T if T has only explicit constructors
          for U).
        </li>
<li class="listitem">
          The <a href="../../boost/lexical_cast.hpp" target="_top">boost/lexical_cast.hpp</a>
          header provides <a href="../../doc/libs/release/libs/lexical_cast/" target="_top"><code class="computeroutput"><span class="identifier">lexical_cast</span><span class="special">&lt;&gt;</span></code></a>
          general literal text conversions, such as an <code class="computeroutput"><span class="keyword">int</span></code>
          represented as a <code class="computeroutput"><span class="identifier">string</span></code>,
          or vice-versa.
        </li>
</ol></div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer"></div></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="container/release_notes.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="libraries.html"><img src="../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="conversion/polymorphic_casts.html"><img src="../../doc/src/images/next.png" alt="Next"></a>
</div>
</body>
</html>