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boost_mpl/doc/refmanual/bind.html
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<?xml version="1.0" encoding="utf-8" ?>
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<title>The MPL Reference Manual: bind</title>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./composition-and-argument.html" class="navigation-link">Composition and Argument Binding</a> / <a href="./bind.html" class="navigation-link">bind</a></td>
</tr></table><div class="header-separator"></div>
<div class="section" id="bind">
<h1><a class="toc-backref" href="./composition-and-argument.html#id457" name="bind">bind</a></h1>
<div class="section" id="bind-synopsis">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
typename F
&gt;
struct bind0
{
// <em>unspecified</em>
// <em>...</em>
};
template&lt;
typename F, typename A1
&gt;
struct bind1
{
// <em>unspecified</em>
// <em>...</em>
};
<em>...</em>
template&lt;
typename F, typename A1,<em>...</em> typename An
&gt;
struct <a href="./bind.html" class="identifier">bind</a><em>n</em>
{
// <em>unspecified</em>
// <em>...</em>
};
template&lt;
typename F
, typename A1 = <em>unspecified</em>
<em>...</em>
, typename An = <em>unspecified</em>
&gt;
struct <a href="./bind.html" class="identifier">bind</a>
{
// <em>unspecified</em>
// <em>...</em>
};
</pre>
</div>
<div class="section" id="bind-description">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p><tt class="literal"><span class="pre"><a href="./bind.html" class="identifier">bind</a></span></tt> is a higher-order primitive for <a class="reference" href="./metafunction-class.html">Metafunction Class</a> composition
and argument binding. In essence, it's a compile-time counterpart of
the similar run-time functionality provided by <a class="reference" href="http://www.boost.org/libs/bind/bind.html" target="_top">Boost.Bind</a> and <a class="reference" href="http://www.boost.org/libs/lambda/doc/index.html" target="_top">Boost.Lambda</a>
libraries.</p>
</div>
<div class="section" id="bind-header">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/bind.hpp" class="header">boost/mpl/bind.hpp</a>&gt;
</pre>
</div>
<div class="section" id="bind-model-of">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference" href="./metafunction-class.html">Metafunction Class</a></p>
</div>
<div class="section" id="bind-parameters">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
<table border="1" class="table">
<colgroup>
<col width="15%" />
<col width="36%" />
<col width="48%" />
</colgroup>
<thead valign="bottom">
<tr><th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">F</span></tt></td>
<td><a class="reference" href="./metafunction-class.html">Metafunction Class</a></td>
<td>An metafunction class to perform binding on.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt></td>
<td>Any type</td>
<td>Arguments to bind.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="bind-expression-semantics">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any <a class="reference" href="./metafunction-class.html">Metafunction Class</a> <tt class="literal"><span class="pre">f</span></tt> and arbitrary types <tt class="literal"><span class="pre">a1</span></tt>,... <tt class="literal"><span class="pre">an</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./bind.html" class="identifier">bind</a>&lt;f,a1,...a<em>n</em>&gt; g;
typedef <a href="./bind.html" class="identifier">bind</a><em>n</em>&lt;f,a1,...a<em>n</em>&gt; g;
</pre>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./metafunction-class.html">Metafunction Class</a></td>
</tr>
</tbody>
</table>
<a class="target" id="bind-semantics" name="bind-semantics"></a><table class="field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="literal-block">
struct g
{
template&lt;
typename U1 = <em>unspecified</em>
<em>...</em>
, typename U<em>n</em> = <em>unspecified</em>
&gt;
struct <a href="./apply.html" class="identifier">apply</a>
: <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>&lt;
typename h0&lt;f,U1,<em>...</em>U<em>n</em>&gt;::type
, typename h1&lt;a1,U1,<em>...</em>U<em>n</em>&gt;::type
<em>...</em>
, typename h<em>n</em>&lt;a<em>n</em>,U1,<em>...</em>U<em>n</em>&gt;::type
>
{
};
};
</pre>
<p>where <tt class="literal"><span class="pre">h</span></tt><em>k</em> is equivalent to</p>
<pre class="literal-block">
template&lt; typename X, typename U1,<em>...</em> typename U<em>n</em> &gt; struct h<em>k</em>
: <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>&lt;X,U1,<em>...</em>U<em>n</em>&gt;
{
};
</pre>
<p>if <tt class="literal"><span class="pre">f</span></tt> or <tt class="literal"><span class="pre">a</span></tt><em>k</em> is a <a class="reference" href="./terminology.html#bind-expression">bind expression</a> or a <a class="reference" href="./placeholders.html">placeholder</a>, and</p>
<pre class="literal-block">
template&lt; typename X, typename U1,<em>...</em> typename U<em>n</em> &gt; struct h<em>k</em>
{
typedef X type;
};
</pre>
<p class="last">otherwise. [<em>Note:</em> Every <tt class="literal"><span class="pre">n</span></tt>th appearance of the <a class="reference" href="./placeholders.html">unnamed placeholder</a>
in the <tt class="literal"><span class="pre"><a href="./bind.html" class="identifier">bind</a>&lt;f,a1,...an&gt;</span></tt> specialization is replaced with the corresponding
numbered placeholder <tt class="literal"><span class="pre">_</span></tt><em>n</em> — <em>end note</em>]</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="bind-example">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
struct f1
{
template&lt; typename T1 &gt; struct <a href="./apply.html" class="identifier">apply</a>
{
typedef T1 type;
};
};
struct f5
{
template&lt; typename T1, typename T2, typename T3, typename T4, typename T5 &gt;
struct <a href="./apply.html" class="identifier">apply</a>
{
typedef T5 type;
};
};
typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>&lt;
<a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">1</span></tt>&lt;f1,_1&gt;
, int
&gt;::type r11;
typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>&lt;
<a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">1</span></tt>&lt;f1,_5&gt;
, void,void,void,void,int
&gt;::type r12;
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;r11,int&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;r12,int&gt; ));
typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>&lt;
<a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">5</span></tt>&lt;f5,_1,_2,_3,_4,_5&gt;
, void,void,void,void,int
&gt;::type r51;
typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>&lt;
<a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">5</span></tt>&lt;f5,_5,_4,_3,_2,_1&gt;
, int,void,void,void,void
&gt;::type r52;
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;r51,int&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;r52,int&gt; ));
</pre>
</div>
<div class="section" id="bind-see-also">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference" href="./composition-and-argument.html">Composition and Argument Binding</a>, <a class="reference" href="./invocation.html">invocation</a>, <a class="reference" href="./placeholders.html">Placeholders</a>, <a class="refentry reference" href="./lambda.html"><tt class="refentry literal"><span class="pre">lambda</span></tt></a>, <a class="refentry reference" href="./quote.html"><tt class="refentry literal"><span class="pre">quote</span></tt></a>,
<a class="refentry reference" href="./protect.html"><tt class="refentry literal"><span class="pre">protect</span></tt></a>, <a class="refentry reference" href="./apply.html"><tt class="refentry literal"><span class="pre">apply</span></tt></a>, <a class="refentry reference" href="./apply-wrap.html"><tt class="refentry literal"><span class="pre">apply_wrap</span></tt></a></p>
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