forked from boostorg/fusion
101 lines
7.7 KiB
HTML
101 lines
7.7 KiB
HTML
|
<html>
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|||
|
|
<title>deduce</title>
|
|||
|
|
<link rel="stylesheet" href="../../boostbook.css" type="text/css">
|
|||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
|||
|
|
<link rel="start" href="../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
|
|||
|
|
<link rel="up" href="../support.html" title="Support">
|
|||
|
|
<link rel="prev" href="category_of.html" title="category_of">
|
|||
|
|
<link rel="next" href="deduce_sequence.html" title="deduce_sequence">
|
|||
|
|
</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.htm">Home</a></td>
|
|||
|
|
<td align="center"><a href="../../../../../libraries.htm">Libraries</a></td>
|
|||
|
|
<td align="center"><a href="../../../../../../people/people.htm">People</a></td>
|
|||
|
|
<td align="center"><a href="../../../../../../more/faq.htm">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="category_of.html"><img src="../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../support.html"><img src="../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="deduce_sequence.html"><img src="../../../../../../doc/html/images/next.png" alt="Next"></a>
|
|||
|
|
</div>
|
|||
|
|
<div class="section" lang="en">
|
|||
|
|
<div class="titlepage"><div><div><h3 class="title">
|
|||
|
|
<a name="fusion.support.deduce"></a><a href="deduce.html" title="deduce">deduce</a></h3></div></div></div>
|
|||
|
|
<a name="fusion.support.deduce.description"></a><h4>
|
|||
|
|
<a name="id464218"></a>
|
|||
|
|
<a href="deduce.html#fusion.support.deduce.description">Description</a>
|
|||
|
|
</h4>
|
|||
|
|
<p>
|
|||
|
|
Metafunction to apply <a href="../notes.html#fusion.notes.element_conversion"><span class="emphasis"><em>element
|
|||
|
|
conversion</em></span></a> to the full argument type.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
It removes references to <tt class="computeroutput"><span class="keyword">const</span></tt>,
|
|||
|
|
references to array types are kept, even if the array is <tt class="computeroutput"><span class="keyword">const</span></tt>.
|
|||
|
|
Reference wrappers are removed (see <a href="../notes.html#fusion.notes.boost__ref"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">ref</span></tt></a>).
|
|||
|
|
</p>
|
|||
|
|
<a name="fusion.support.deduce.header"></a><h4>
|
|||
|
|
<a name="id464317"></a>
|
|||
|
|
<a href="deduce.html#fusion.support.deduce.header">Header</a>
|
|||
|
|
</h4>
|
|||
|
|
<pre class="programlisting">
|
|||
|
|
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">support</span><span class="special">/</span><span class="identifier">deduce</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
|||
|
|
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">deduce</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
|||
|
|
</pre>
|
|||
|
|
<a name="fusion.support.deduce.synopsis"></a><h4>
|
|||
|
|
<a name="id464474"></a>
|
|||
|
|
<a href="deduce.html#fusion.support.deduce.synopsis">Synopsis</a>
|
|||
|
|
</h4>
|
|||
|
|
<pre class="programlisting">
|
|||
|
|
<span class="keyword">namespace</span> <span class="identifier">traits</span>
|
|||
|
|
<span class="special">{</span>
|
|||
|
|
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
|
|||
|
|
<span class="keyword">struct</span> <span class="identifier">deduce</span>
|
|||
|
|
<span class="special">{</span>
|
|||
|
|
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
|
|||
|
|
<span class="special">};</span>
|
|||
|
|
<span class="special">}</span>
|
|||
|
|
</pre>
|
|||
|
|
<a name="fusion.support.deduce.example"></a><h4>
|
|||
|
|
<a name="id464605"></a>
|
|||
|
|
<a href="deduce.html#fusion.support.deduce.example">Example</a>
|
|||
|
|
</h4>
|
|||
|
|
<pre class="programlisting">
|
|||
|
|
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
|
|||
|
|
<span class="keyword">struct</span> <span class="identifier">holder</span>
|
|||
|
|
<span class="special">{</span>
|
|||
|
|
<span class="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">deduce</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&>::</span><span class="identifier">type</span> <span class="identifier">element</span><span class="special">;</span>
|
|||
|
|
|
|||
|
|
<span class="identifier">holder</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a</span><span class="special">)</span>
|
|||
|
|
<span class="special">:</span> <span class="identifier">element</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span>
|
|||
|
|
<span class="special">{</span> <span class="special">}</span>
|
|||
|
|
<span class="special">};</span>
|
|||
|
|
|
|||
|
|
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
|
|||
|
|
<span class="identifier">holder</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">make_holder</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a</span><span class="special">)</span>
|
|||
|
|
<span class="special">{</span>
|
|||
|
|
<span class="keyword">return</span> <span class="identifier">holder</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">a</span><span class="special">);</span>
|
|||
|
|
<span class="special">}</span>
|
|||
|
|
</pre>
|
|||
|
|
<a name="fusion.support.deduce.see_also"></a><h4>
|
|||
|
|
<a name="id464970"></a>
|
|||
|
|
<a href="deduce.html#fusion.support.deduce.see_also">See also</a>
|
|||
|
|
</h4>
|
|||
|
|
<div class="itemizedlist"><ul type="disc"><li><a href="deduce_sequence.html" title="deduce_sequence"><tt class="computeroutput"><span class="identifier">deduce_sequence</span></tt></a></li></ul></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"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
|
|||
|
|
Schwinger</small></td>
|
|||
|
|
</tr></table>
|
|||
|
|
<hr>
|
|||
|
|
<div class="spirit-nav">
|
|||
|
|
<a accesskey="p" href="category_of.html"><img src="../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../support.html"><img src="../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="deduce_sequence.html"><img src="../../../../../../doc/html/images/next.png" alt="Next"></a>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|