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| 25 | <div class="section" lang="en"> | 
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| 26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | 
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| 27 | <a name="function.reference"></a>Reference</h2></div></div></div> | 
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| 28 | <div class="toc"><dl> | 
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| 29 | <dt><span class="section"><a href="reference.html#function.definitions">Definitions</a></span></dt> | 
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| 30 | <dt><span class="section"><a href="reference.html#header.boost.function.hpp">Header <boost/function.hpp></a></span></dt> | 
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| 31 | <dt><span class="section"><a href="reference.html#header.boost.function_equal.hpp">Header <boost/function_equal.hpp></a></span></dt> | 
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| 32 | </dl></div> | 
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| 33 | <div class="section" lang="en"> | 
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| 34 | <div class="titlepage"><div><div><h3 class="title"> | 
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| 35 | <a name="function.definitions"></a>Definitions</h3></div></div></div> | 
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| 36 | <p> | 
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| 37 |   </p> | 
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| 38 | <div class="itemizedlist"><ul type="disc"> | 
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| 39 | <li> | 
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| 40 | <p>A function object <code class="computeroutput">f</code> is | 
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| 41 |       <span class="emphasis"><em>compatible</em></span> if for the given set of argument | 
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| 42 |       types <code class="computeroutput">Arg1</code>, | 
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| 43 |       <code class="computeroutput">Arg2</code>, ..., | 
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| 44 |       <code class="computeroutput">ArgN</code> and a | 
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| 45 |       return type <code class="computeroutput">ResultType</code>, the | 
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| 46 |       appropriate following function is well-formed: | 
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| 47 | </p> | 
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| 48 | <pre class="programlisting"> | 
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| 49 |   <span class="emphasis"><em>// if ResultType is not <span class="bold"><strong>void</strong></span></em></span> | 
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| 50 |   ResultType foo(Arg1 arg1, Arg2 arg2, ..., Arg<span class="emphasis"><em>N</em></span> arg<span class="emphasis"><em>N</em></span>) | 
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| 51 |   { | 
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| 52 |     <span class="bold"><strong>return</strong></span> f(arg1, arg2, ..., arg<span class="emphasis"><em>N</em></span>); | 
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| 53 |   } | 
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| 54 |  | 
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| 55 |   <span class="emphasis"><em>// if ResultType is <span class="bold"><strong>void</strong></span></em></span> | 
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| 56 |   ResultType foo(Arg1 arg1, Arg2 arg2, ..., Arg<span class="emphasis"><em>N</em></span> arg<span class="emphasis"><em>N</em></span>) | 
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| 57 |   { | 
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| 58 |     f(arg1, arg2, ..., arg<span class="emphasis"><em>N</em></span>); | 
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| 59 |   } | 
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| 60 | </pre> | 
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| 61 | <p> A special provision is made for pointers to member | 
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| 62 |       functions. Though they are not function objects, Boost.Function | 
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| 63 |       will adapt them internally to function objects. This requires | 
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| 64 |       that a pointer to member function of the form <code class="computeroutput">R | 
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| 65 |       (X::*mf)(Arg1, Arg2, ..., ArgN) | 
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| 66 |       cv-quals</code> be adapted to a | 
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| 67 |       function object with the following function call operator | 
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| 68 |       overloads: | 
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| 69 | </p> | 
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| 70 | <pre class="programlisting"> | 
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| 71 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename P</strong></span>> | 
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| 72 |   R <span class="bold"><strong>operator</strong></span>()(<span class="emphasis"><em>cv-quals</em></span> P& x, Arg1 arg1, Arg2 arg2, ..., Arg<span class="emphasis"><em>N</em></span> arg<span class="emphasis"><em>N</em></span>) <span class="bold"><strong>const</strong></span> | 
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| 73 |   { | 
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| 74 |     <span class="bold"><strong>return</strong></span> (*x).*mf(arg1, arg2, ..., arg<span class="emphasis"><em>N</em></span>); | 
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| 75 |   } | 
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| 76 | </pre> | 
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| 77 | <p> | 
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| 78 | </p> | 
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| 79 | </li> | 
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| 80 | <li><p>A function object <code class="computeroutput">f</code> of | 
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| 81 |       type <code class="computeroutput">F</code> is | 
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| 82 |       <span class="emphasis"><em>stateless</em></span> if it is a function pointer or if | 
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| 83 |       <code class="computeroutput">boost::is_stateless<T></code> | 
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| 84 |       is true. The construction of or copy to a Boost.Function object | 
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| 85 |       from a stateless function object will not cause exceptions to be | 
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| 86 |       thrown and will not allocate any storage. | 
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| 87 |       </p></li> | 
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| 88 | </ul></div> | 
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| 89 | <p> | 
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| 90 | </p> | 
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| 91 | </div> | 
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| 92 | <div class="section" lang="en"> | 
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| 93 | <div class="titlepage"><div><div><h3 class="title"> | 
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| 94 | <a name="header.boost.function.hpp"></a>Header <<a href="../../../boost/function.hpp" target="_top">boost/function.hpp</a>></h3></div></div></div> | 
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| 95 | <pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost { | 
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| 96 |   <span class="bold"><strong>class</strong></span> <a href="../boost/bad_function_call.html" title="Class bad_function_call">bad_function_call</a>; | 
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| 97 |   <span class="bold"><strong>class</strong></span> <a href="../boost/function_base.html" title="Class function_base">function_base</a>; | 
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| 98 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> R, <span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN,  | 
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| 99 |            <span class="bold"><strong>typename</strong></span> Allocator = std::allocator<<span class="bold"><strong>void</strong></span>> >  | 
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| 100 |     <span class="bold"><strong>class</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a>; | 
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| 101 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator>  | 
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| 102 |     <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../boost/functionN.html#id830916-bb">swap</a>(<a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&,  | 
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| 103 |               <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&); | 
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| 104 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 105 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 106 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id694161-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&, Functor); | 
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| 107 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 108 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 109 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id649224-bb"><span class="bold"><strong>operator</strong></span>==</a>(Functor, <span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&); | 
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| 110 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 111 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 112 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id663663-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&,  | 
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| 113 |                     <a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>); | 
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| 114 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 115 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 116 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id856748-bb"><span class="bold"><strong>operator</strong></span>==</a>(<a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>,  | 
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| 117 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&); | 
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| 118 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator1,  | 
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| 119 |            <span class="bold"><strong>typename</strong></span> U1, <span class="bold"><strong>typename</strong></span> U2, ..., <span class="bold"><strong>typename</strong></span> UN, <span class="bold"><strong>typename</strong></span> Allocator2>  | 
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| 120 |     <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../boost/functionN.html#id687298-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator1>&,  | 
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| 121 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><U1, U2, ..., UN, Allocator2>&); | 
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| 122 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 123 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 124 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id660679-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&, Functor); | 
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| 125 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 126 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 127 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id682340-bb"><span class="bold"><strong>operator</strong></span>!=</a>(Functor, <span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&); | 
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| 128 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 129 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 130 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id628406-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&,  | 
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| 131 |                     <a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>); | 
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| 132 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator,  | 
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| 133 |            <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 134 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/functionN.html#id792057-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>,  | 
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| 135 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator>&); | 
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| 136 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T1, <span class="bold"><strong>typename</strong></span> T2, ..., <span class="bold"><strong>typename</strong></span> TN, <span class="bold"><strong>typename</strong></span> Allocator1,  | 
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| 137 |            <span class="bold"><strong>typename</strong></span> U1, <span class="bold"><strong>typename</strong></span> U2, ..., <span class="bold"><strong>typename</strong></span> UN, <span class="bold"><strong>typename</strong></span> Allocator2>  | 
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| 138 |     <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../boost/functionN.html#id834428-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><T1, T2, ..., TN, Allocator1>&,  | 
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| 139 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/functionN.html" title="Class template functionN">functionN</a><U1, U2, ..., UN, Allocator2>&); | 
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| 140 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator = std::allocator<<span class="bold"><strong>void</strong></span>> >  | 
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| 141 |     <span class="bold"><strong>class</strong></span> <a href="../boost/function.html" title="Class template function">function</a>; | 
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| 142 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator>  | 
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| 143 |     <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../boost/function.html#id754994-bb">swap</a>(<a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&,  | 
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| 144 |               <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&); | 
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| 145 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 146 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id717925-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&, Functor); | 
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| 147 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 148 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id786913-bb"><span class="bold"><strong>operator</strong></span>==</a>(Functor, <span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&); | 
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| 149 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 150 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id683534-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&,  | 
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| 151 |                     <a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>); | 
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| 152 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 153 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id733745-bb"><span class="bold"><strong>operator</strong></span>==</a>(<a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>,  | 
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| 154 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&); | 
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| 155 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature1, <span class="bold"><strong>typename</strong></span> Allocator1, <span class="bold"><strong>typename</strong></span> Signature2,  | 
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| 156 |            <span class="bold"><strong>typename</strong></span> Allocator2>  | 
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| 157 |     <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../boost/function.html#id768895-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature1, Allocator1>&,  | 
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| 158 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature2, Allocator2>&); | 
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| 159 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 160 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id792627-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&, Functor); | 
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| 161 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 162 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id897105-bb"><span class="bold"><strong>operator</strong></span>!=</a>(Functor, <span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&); | 
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| 163 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 164 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id827204-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&,  | 
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| 165 |                     <a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>); | 
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| 166 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature, <span class="bold"><strong>typename</strong></span> Allocator, <span class="bold"><strong>typename</strong></span> Functor>  | 
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| 167 |     <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function.html#id730783-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<a href="../boost/reference_wrapper.html" title="Class template reference_wrapper">reference_wrapper</a><Functor>,  | 
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| 168 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature, Allocator>&); | 
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| 169 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Signature1, <span class="bold"><strong>typename</strong></span> Allocator1, <span class="bold"><strong>typename</strong></span> Signature2,  | 
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| 170 |            <span class="bold"><strong>typename</strong></span> Allocator2>  | 
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| 171 |     <span class="type"><span class="bold"><strong>void</strong></span></span> <a href="../boost/function.html#id732711-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature1, Allocator1>&,  | 
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| 172 |                     <span class="bold"><strong>const</strong></span> <a href="../boost/function.html" title="Class template function">function</a><Signature2, Allocator2>&); | 
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| 173 | }</pre> | 
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| 174 | </div> | 
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| 175 | <div class="section" lang="en"> | 
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| 176 | <div class="titlepage"><div><div><h3 class="title"> | 
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| 177 | <a name="header.boost.function_equal.hpp"></a>Header <<a href="../../../boost/function_equal.hpp" target="_top">boost/function_equal.hpp</a>></h3></div></div></div> | 
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| 178 | <pre class="synopsis"><span class="bold"><strong>namespace</strong></span> boost { | 
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| 179 |   <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> F, <span class="bold"><strong>typename</strong></span> G> <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="../boost/function_equal.html" title="Function template function_equal">function_equal</a>(<span class="bold"><strong>const</strong></span> F&, <span class="bold"><strong>const</strong></span> G&); | 
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| 180 | }</pre> | 
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| 181 | </div> | 
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| 182 | </div> | 
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| 183 | <table width="100%"><tr> | 
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| 184 | <td align="left"></td> | 
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| 185 | <td align="right"><small>Copyright © 2001-2004 Douglas Gregor</small></td> | 
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| 186 | </tr></table> | 
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| 187 | <hr> | 
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| 188 | <div class="spirit-nav"> | 
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| 189 | <a accesskey="p" href="tutorial.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../function.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="../boost/bad_function_call.html"><img src="../images/next.png" alt="Next"></a> | 
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| 190 | </div> | 
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| 191 | </body> | 
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| 192 | </html> | 
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