1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Polymorphic Function Object</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.2"> 8<link rel="up" href="../concepts.html" title="Concepts"> 9<link rel="prev" href="def_callable.html" title="Deferred Callable Object"> 10<link rel="next" href="../invocation.html" title="Invocation"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="def_callable.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="../invocation.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="fusion.functional.concepts.poly"></a><a class="link" href="poly.html" title="Polymorphic Function Object">Polymorphic Function 28 Object</a> 29</h4></div></div></div> 30<h6> 31<a name="fusion.functional.concepts.poly.h0"></a> 32 <span class="phrase"><a name="fusion.functional.concepts.poly.description"></a></span><a class="link" href="poly.html#fusion.functional.concepts.poly.description">Description</a> 33 </h6> 34<p> 35 A non-member-pointer <a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred 36 Callable Object</a> type. 37 </p> 38<h6> 39<a name="fusion.functional.concepts.poly.h1"></a> 40 <span class="phrase"><a name="fusion.functional.concepts.poly.refinement_of"></a></span><a class="link" href="poly.html#fusion.functional.concepts.poly.refinement_of">Refinement 41 of</a> 42 </h6> 43<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 44<li class="listitem"> 45 <a class="link" href="reg_callable.html" title="Regular Callable Object">Regular Callable 46 Object</a> 47 </li> 48<li class="listitem"> 49 <a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred Callable 50 Object</a> 51 </li> 52</ul></div> 53<div class="variablelist"> 54<p class="title"><b>Notation</b></p> 55<dl class="variablelist"> 56<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt> 57<dd><p> 58 A possibly const-qualified Polymorphic Function Object type 59 </p></dd> 60<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt> 61<dd><p> 62 An object or reference to an object of type F 63 </p></dd> 64<dt><span class="term"><code class="computeroutput"><span class="identifier">A1</span> <span class="special">...</span><span class="identifier">AN</span></code></span></dt> 65<dd><p> 66 Argument types 67 </p></dd> 68<dt><span class="term"><code class="computeroutput"><span class="identifier">a1</span> <span class="special">...</span><span class="identifier">aN</span></code></span></dt> 69<dd><p> 70 Objects or references to objects with types <code class="computeroutput"><span class="identifier">A1</span> 71 <span class="special">...</span><span class="identifier">AN</span></code> 72 </p></dd> 73<dt><span class="term"><code class="computeroutput"><span class="identifier">T1</span> <span class="special">...</span><span class="identifier">TN</span></code></span></dt> 74<dd><p> 75 <code class="computeroutput"><span class="identifier">T</span></code>i is <code class="computeroutput"><span class="identifier">A</span></code>i <code class="computeroutput"><span class="special">&</span></code> 76 if <code class="computeroutput"><span class="identifier">a</span></code>i is an LValue, 77 same as <code class="computeroutput"><span class="identifier">A</span></code>i, otherwise 78 </p></dd> 79</dl> 80</div> 81<h6> 82<a name="fusion.functional.concepts.poly.h2"></a> 83 <span class="phrase"><a name="fusion.functional.concepts.poly.expression_requirements"></a></span><a class="link" href="poly.html#fusion.functional.concepts.poly.expression_requirements">Expression 84 requirements</a> 85 </h6> 86<div class="informaltable"><table class="table"> 87<colgroup> 88<col> 89<col> 90<col> 91</colgroup> 92<thead><tr> 93<th> 94 <p> 95 Expression 96 </p> 97 </th> 98<th> 99 <p> 100 Return Type 101 </p> 102 </th> 103<th> 104 <p> 105 Runtime Complexity 106 </p> 107 </th> 108</tr></thead> 109<tbody><tr> 110<td> 111 <p> 112 <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">a1</span><span class="special">,</span> 113 <span class="special">...</span><span class="identifier">aN</span><span class="special">)</span></code> 114 </p> 115 </td> 116<td> 117 <p> 118 <code class="computeroutput"><span class="identifier">result_of</span><span class="special"><</span> 119 <span class="identifier">F</span><span class="special">(</span><span class="identifier">T1</span><span class="special">,</span> 120 <span class="special">...</span><span class="identifier">TN</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">type</span></code> 121 </p> 122 </td> 123<td> 124 <p> 125 Unspecified 126 </p> 127 </td> 128</tr></tbody> 129</table></div> 130<h6> 131<a name="fusion.functional.concepts.poly.h3"></a> 132 <span class="phrase"><a name="fusion.functional.concepts.poly.models"></a></span><a class="link" href="poly.html#fusion.functional.concepts.poly.models">Models</a> 133 </h6> 134<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 135<li class="listitem"> 136 function pointers 137 </li> 138<li class="listitem"> 139 function objects of the Standard Library 140 </li> 141<li class="listitem"> 142 all Fusion <a class="link" href="../adapters.html" title="Adapters">functional adapters</a> 143 </li> 144</ul></div> 145<h6> 146<a name="fusion.functional.concepts.poly.h4"></a> 147 <span class="phrase"><a name="fusion.functional.concepts.poly.examples"></a></span><a class="link" href="poly.html#fusion.functional.concepts.poly.examples">Examples</a> 148 </h6> 149<pre class="programlisting"><span class="special">&</span> <span class="identifier">a_free_function</span> 150<span class="special">&</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_static_member_function</span> 151<span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">>()</span> 152<span class="comment">// using namespace boost;</span> 153<span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(),</span> <span class="identifier">_1</span><span class="special">,</span> <span class="number">5</span><span class="special">)</span> 154<span class="comment">// Note: Boost.Lambda expressions don't work with __boost_result_of__</span> 155<span class="identifier">fusion</span><span class="special">::</span><a class="link" href="../generation/functions/mk_fused_fobj.html" title="make_fused_function_object"><code class="computeroutput"><span class="identifier">make_fused_function_object</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">>())</span> 156</pre> 157</div> 158<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 159<td align="left"></td> 160<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 161 Dan Marsden, Tobias Schwinger<p> 162 Distributed under the Boost Software License, Version 1.0. (See accompanying 163 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>) 164 </p> 165</div></td> 166</tr></table> 167<hr> 168<div class="spirit-nav"> 169<a accesskey="p" href="def_callable.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="../invocation.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 170</div> 171</body> 172</html> 173
