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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-binding.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-binding.html#id1531">bind</a></h1> |
| <div class="section" id="id929"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename F |
| > |
| struct bind0 |
| { |
| // <em>unspecified</em> |
| // <em>...</em> |
| }; |
| |
| template< |
| typename F, typename A1 |
| > |
| struct bind1 |
| { |
| // <em>unspecified</em> |
| // <em>...</em> |
| }; |
| |
| <em>...</em> |
| |
| template< |
| typename F, typename A1,<em>...</em> typename An |
| > |
| struct <a href="./bind.html" class="identifier">bind</a><em>n</em> |
| { |
| // <em>unspecified</em> |
| // <em>...</em> |
| }; |
| |
| template< |
| typename F |
| , typename A1 = <em>unspecified</em> |
| <em>...</em> |
| , typename An = <em>unspecified</em> |
| > |
| struct <a href="./bind.html" class="identifier">bind</a> |
| { |
| // <em>unspecified</em> |
| // <em>...</em> |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id930"> |
| <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 internal" 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 external" href="http://www.boost.org/libs/bind/bind.html" target="_top">Boost.Bind</a> and <a class="reference external" href="http://www.boost.org/libs/lambda/doc/index.html" target="_top">Boost.Lambda</a> |
| libraries.</p> |
| </div> |
| <div class="section" id="id931"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/bind.hpp" class="header">boost/mpl/bind.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id932"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
| <p><a class="reference internal" href="./metafunction-class.html">Metafunction Class</a></p> |
| </div> |
| <div class="section" id="id933"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="15%" /> |
| <col width="36%" /> |
| <col width="48%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Parameter</th> |
| <th class="head">Requirement</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre">F</span></tt></td> |
| <td><a class="reference internal" 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="id934"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>For any <a class="reference internal" 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><f,a1,...a<em>n</em>> g; |
| typedef <a href="./bind.html" class="identifier">bind</a><em>n</em><f,a1,...a<em>n</em>> g; |
| </pre> |
| <table class="docutils 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 internal" href="./metafunction-class.html">Metafunction Class</a></td> |
| </tr> |
| </tbody> |
| </table> |
| <table class="docutils field-list" frame="void" id="bind-semantics" 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< |
| typename U1 = <em>unspecified</em> |
| <em>...</em> |
| , typename U<em>n</em> = <em>unspecified</em> |
| > |
| struct <a href="./apply.html" class="identifier">apply</a> |
| : <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em>< |
| typename h0<f,U1,<em>...</em>U<em>n</em>>::type |
| , typename h1<a1,U1,<em>...</em>U<em>n</em>>::type |
| <em>...</em> |
| , typename h<em>n</em><a<em>n</em>,U1,<em>...</em>U<em>n</em>>::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< typename X, typename U1,<em>...</em> typename U<em>n</em> > struct h<em>k</em> |
| : <a href="./apply-wrap.html" class="identifier">apply_wrap</a><em>n</em><X,U1,<em>...</em>U<em>n</em>> |
| { |
| }; |
| </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 internal" href="./terminology.html#bind-expression">bind expression</a> or a <a class="reference internal" href="./placeholders.html#placeholder">placeholder</a>, and</p> |
| <pre class="literal-block"> |
| template< typename X, typename U1,<em>...</em> typename U<em>n</em> > 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 internal" href="./placeholders.html">unnamed placeholder</a> |
| in the <tt class="literal"><span class="pre"><a href="./bind.html" class="identifier">bind</a><f,a1,...an></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="id936"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| struct f1 |
| { |
| template< typename T1 > struct <a href="./apply.html" class="identifier">apply</a> |
| { |
| typedef T1 type; |
| }; |
| }; |
| |
| struct f5 |
| { |
| template< typename T1, typename T2, typename T3, typename T4, typename T5 > |
| 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>< |
| <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">1</span></tt><f1,<a href="./placeholders.html" class="identifier">_1</a>> |
| , int |
| >::type r11; |
| |
| typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< |
| <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">1</span></tt><f1,<a href="./placeholders.html" class="identifier">_5</a>> |
| , void,void,void,void,int |
| >::type r12; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r11,int> )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r12,int> )); |
| |
| typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< |
| <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">5</span></tt><f5,<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_3</a>,<a href="./placeholders.html" class="identifier">_4</a>,<a href="./placeholders.html" class="identifier">_5</a>> |
| , void,void,void,void,int |
| >::type r51; |
| |
| typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">5</span></tt>< |
| <a href="./bind.html" class="identifier">bind</a><tt class="literal"><span class="pre">5</span></tt><f5,<a href="./placeholders.html" class="identifier">_5</a>,<a href="./placeholders.html" class="identifier">_4</a>,<a href="./placeholders.html" class="identifier">_3</a>,<a href="./placeholders.html" class="identifier">_2</a>,<a href="./placeholders.html" class="identifier">_1</a>> |
| , int,void,void,void,void |
| >::type r52; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r51,int> )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<r52,int> )); |
| </pre> |
| </div> |
| <div class="section" id="id937"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./composition-and-argument-binding.html">Composition and Argument Binding</a>, <a class="reference internal" href="./invocation.html">invocation</a>, <a class="reference internal" href="./placeholders.html">Placeholders</a>, <a class="reference internal" href="./lambda.html">lambda</a>, <a class="reference internal" href="./quote.html">quote</a>, |
| <a class="reference internal" href="./protect.html">protect</a>, <a class="reference internal" href="./apply.html">apply</a>, <a class="reference internal" href="./apply-wrap.html">apply_wrap</a></p> |
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