1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Struct template expr</title> 6<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../proto/reference.html#header.boost.proto.expr_hpp" title="Header <boost/proto/expr.hpp>"> 10<link rel="prev" href="basic_expr.html" title="Struct template basic_expr"> 11<link rel="next" href="expr/result.html" title="Struct template result"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 16<td align="center"><a href="../../../../index.html">Home</a></td> 17<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="basic_expr.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.expr_hpp"><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="expr/result.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.proto.expr"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct template expr</span></h2> 30<p>boost::proto::expr — Representation of a node in an expression tree.</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../proto/reference.html#header.boost.proto.expr_hpp" title="Header <boost/proto/expr.hpp>">boost/proto/expr.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Tag<span class="special">,</span> <span class="keyword">typename</span> Args<span class="special">,</span> <span class="keyword">long</span> Arity <span class="special">=</span> <span class="identifier">Args</span><span class="special">::</span><span class="identifier">arity</span><span class="special">></span> 36<span class="keyword">struct</span> <a class="link" href="expr.html" title="Struct template expr">expr</a> <span class="special">{</span> 37 <span class="comment">// types</span> 38 <span class="keyword">typedef</span> <span class="identifier">Tag</span> <a name="boost.proto.expr.proto_tag"></a><span class="identifier">proto_tag</span><span class="special">;</span> 39 <span class="keyword">typedef</span> <span class="identifier">Args</span> <a name="boost.proto.expr.proto_args"></a><span class="identifier">proto_args</span><span class="special">;</span> 40 <span class="keyword">typedef</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">long_</span><span class="special"><</span> <span class="identifier">Arity</span> <span class="special">></span> <a name="boost.proto.expr.proto_arity"></a><span class="identifier">proto_arity</span><span class="special">;</span> 41 <span class="keyword">typedef</span> <a class="link" href="default_domain.html" title="Struct default_domain">proto::default_domain</a> <a name="boost.proto.expr.proto_domain"></a><span class="identifier">proto_domain</span><span class="special">;</span> 42 <span class="keyword">typedef</span> <a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><span class="special"><</span> <span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">,</span> <span class="identifier">Arity</span> <span class="special">></span> <a name="boost.proto.expr.proto_grammar"></a><span class="identifier">proto_grammar</span><span class="special">;</span> 43 <span class="keyword">typedef</span> <span class="identifier">expr</span> <a name="boost.proto.expr.proto_base_expr"></a><span class="identifier">proto_base_expr</span><span class="special">;</span> 44 <span class="keyword">typedef</span> <span class="identifier">expr</span> <a name="boost.proto.expr.proto_derived_expr"></a><span class="identifier">proto_derived_expr</span><span class="special">;</span> 45 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Args</span><span class="special">::</span><span class="identifier">child</span><em class="replaceable"><code><span class="identifier">N</span></code></em> <a name="boost.proto.expr.proto_childN"></a><span class="identifier">proto_childN</span><span class="special">;</span> <span class="comment">// For each <em class="replaceable"><code>N</code></em> in <em class="replaceable"><code>[0,max(Arity,1))</code></em>.</span> 46 47 <span class="comment">// member classes/structs/unions</span> 48 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Signature<span class="special">></span> 49 <span class="keyword">struct</span> <a class="link" href="expr/result.html" title="Struct template result">result</a> <span class="special">{</span> 50 <span class="comment">// types</span> 51 <span class="keyword">typedef</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr/result.html#boost.proto.expr.result.type"><span class="identifier">type</span></a><span class="special">;</span> 52 <span class="special">}</span><span class="special">;</span> 53 54 <span class="comment">// <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_13-bb">public static functions</a></span> 55 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> <span class="keyword">static</span> <span class="identifier">expr</span> <span class="keyword">const</span> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_13_1-bb"><span class="identifier">make</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">...</span><span class="special">)</span><span class="special">;</span> 56 57 <span class="comment">// <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14-bb">public member functions</a></span> 58 <span class="identifier">expr</span> <span class="special">&</span> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_1-bb"><span class="identifier">proto_base</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> 59 <span class="identifier">expr</span> <span class="keyword">const</span> <span class="special">&</span> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_2-bb"><span class="identifier">proto_base</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 60 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_3-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 61 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_4-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 62 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_5-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 63 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_6-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 64 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_7-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 65 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_8-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> 66 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_9-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 67 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_10-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 68 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_11-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">...</span><span class="special">)</span><span class="special">;</span> 69 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_33_5_9_1_1_2_14_12-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">...</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 70 71 <span class="comment">// public data members</span> 72 <span class="identifier">proto_child</span><em class="replaceable"><code><span class="identifier">N</span></code></em> <span class="identifier">childN</span><span class="special">;</span> <span class="comment">// For each <em class="replaceable"><code>N</code></em> in <em class="replaceable"><code>[0,max(Arity,1))</code></em>.</span> 73 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">long</span> <span class="identifier">proto_arity_c</span><span class="special">;</span> <span class="comment">// <code class="computeroutput">= Arity;</code></span> 74<span class="special">}</span><span class="special">;</span></pre></div> 75<div class="refsect1"> 76<a name="id-1.3.33.5.11.4.4"></a><h2>Description</h2> 77<p> 78 <code class="computeroutput">proto::expr<></code> is a node in an expression 79 template tree. It is a container for its child sub-trees. It also serves as the 80 terminal nodes of the tree. 81 </p> 82<p> 83 <code class="computeroutput">Tag</code> is type that represents the operation 84 encoded by this expression. It is typically one of the structs in the 85 <code class="computeroutput">boost::proto::tag</code> namespace, but it doesn't 86 have to be. If <code class="computeroutput">Arity</code> is 0 then this 87 <code class="computeroutput">expr<></code> type represents a leaf in the 88 expression tree. 89 </p> 90<p> 91 <code class="computeroutput">Args</code> is a list of types representing 92 the children of this expression. It is an instantiation of one of 93 <code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::list1<></a></code>, 94 <code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::list2<></a></code>, 95 etc. The child types 96 must all themselves be either <code class="computeroutput">proto::expr<></code> 97 or <code class="computeroutput">proto::basic_expr<>&</code> (or extensions thereof via 98 <code class="computeroutput"><a class="link" href="extends.html" title="Struct template extends">proto::extends<></a></code> or 99 <code class="computeroutput"><a class="link" href="../../BOOST_PROTO_EXTENDS.html" title="Macro BOOST_PROTO_EXTENDS">BOOST_PROTO_EXTENDS</a>()</code>), unless 100 <code class="computeroutput">Arity</code> is 0, in which case 101 <code class="computeroutput">Args</code> must be 102 <code class="computeroutput">proto::term<T></code>, where 103 <code class="computeroutput">T</code> can be any type. 104 </p> 105<p> 106 <code class="computeroutput">proto::expr<></code> is a valid Fusion 107 random-access sequence, where the elements of the sequence are the child 108 expressions. 109 </p> 110<div class="refsect2"> 111<a name="id-1.3.33.5.11.4.4.6"></a><h3> 112<a name="id-1_3_33_5_9_1_1_2_13-bb"></a><code class="computeroutput">expr</code> public static functions</h3> 113<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 114<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> <span class="keyword">static</span> <span class="identifier">expr</span> <span class="keyword">const</span> <a name="id-1_3_33_5_9_1_1_2_13_1-bb"></a><span class="identifier">make</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">...</span> a<span class="special">)</span><span class="special">;</span></pre> 115<div class="variablelist"><table border="0" class="variablelist compact"> 116<colgroup> 117<col align="left" valign="top"> 118<col> 119</colgroup> 120<tbody> 121<tr> 122<td><p><span class="term">Requires:</span></p></td> 123<td><p> 124 The number of supplied arguments must be <code class="computeroutput">max(Arity,1)</code>. 125 </p></td> 126</tr> 127<tr> 128<td><p><span class="term">Returns:</span></p></td> 129<td><p> 130 A new <code class="computeroutput">expr</code> object initialized with the specified arguments. 131 </p></td> 132</tr> 133</tbody> 134</table></div> 135</li></ol></div> 136</div> 137<div class="refsect2"> 138<a name="id-1.3.33.5.11.4.4.7"></a><h3> 139<a name="id-1_3_33_5_9_1_1_2_14-bb"></a><code class="computeroutput">expr</code> public member functions</h3> 140<div class="orderedlist"><ol class="orderedlist" type="1"> 141<li class="listitem"> 142<pre class="literallayout"><span class="identifier">expr</span> <span class="special">&</span> <a name="id-1_3_33_5_9_1_1_2_14_1-bb"></a><span class="identifier">proto_base</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> 143<div class="variablelist"><table border="0" class="variablelist compact"> 144<colgroup> 145<col align="left" valign="top"> 146<col> 147</colgroup> 148<tbody><tr> 149<td><p><span class="term">Returns:</span></p></td> 150<td><p><code class="computeroutput">*this</code></p></td> 151</tr></tbody> 152</table></div> 153</li> 154<li class="listitem"> 155<pre class="literallayout"><span class="identifier">expr</span> <span class="keyword">const</span> <span class="special">&</span> <a name="id-1_3_33_5_9_1_1_2_14_2-bb"></a><span class="identifier">proto_base</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 156<p>This is an overloaded member function, provided for convenience. It differs from 157 the above function only in what argument(s) it accepts.</p> 158</li> 159<li class="listitem"> 160<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_3-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span> a<span class="special">)</span><span class="special">;</span></pre> 161<p>Lazy assignment expression</p> 162<div class="variablelist"><table border="0" class="variablelist compact"> 163<colgroup> 164<col align="left" valign="top"> 165<col> 166</colgroup> 167<tbody><tr> 168<td><p><span class="term">Returns:</span></p></td> 169<td><p>A new expression node representing the assignment operation.</p></td> 170</tr></tbody> 171</table></div> 172</li> 173<li class="listitem"> 174<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_4-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span> a<span class="special">)</span><span class="special">;</span></pre> 175<p> 176 This is an overloaded member function, provided for convenience. It differs from 177 the above function only in what argument(s) it accepts. 178 </p> 179</li> 180<li class="listitem"> 181<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_5-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 182<p> 183 This is an overloaded member function, provided for convenience. It differs from 184 the above function only in what argument(s) it accepts. 185 </p> 186</li> 187<li class="listitem"> 188<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_6-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 189<p> 190 This is an overloaded member function, provided for convenience. It differs from 191 the above function only in what argument(s) it accepts. 192 </p> 193</li> 194<li class="listitem"> 195<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_7-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span> a<span class="special">)</span><span class="special">;</span></pre> 196<p>Lazy subscript expression</p> 197<div class="variablelist"><table border="0" class="variablelist compact"> 198<colgroup> 199<col align="left" valign="top"> 200<col> 201</colgroup> 202<tbody><tr> 203<td><p><span class="term">Returns:</span></p></td> 204<td><p>A new expression node representing the subscript operation.</p></td> 205</tr></tbody> 206</table></div> 207</li> 208<li class="listitem"> 209<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_8-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span> a<span class="special">)</span><span class="special">;</span></pre> 210<p> 211 This is an overloaded member function, provided for convenience. It differs from 212 the above function only in what argument(s) it accepts. 213 </p> 214</li> 215<li class="listitem"> 216<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_9-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 217<p> 218 This is an overloaded member function, provided for convenience. It differs from 219 the above function only in what argument(s) it accepts. 220 </p> 221</li> 222<li class="listitem"> 223<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_10-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 224<p> 225 This is an overloaded member function, provided for convenience. It differs from 226 the above function only in what argument(s) it accepts. 227 </p> 228</li> 229<li class="listitem"> 230<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_11-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">...</span> a<span class="special">)</span><span class="special">;</span></pre> 231<p>Lazy function call</p> 232<div class="variablelist"><table border="0" class="variablelist compact"> 233<colgroup> 234<col align="left" valign="top"> 235<col> 236</colgroup> 237<tbody><tr> 238<td><p><span class="term">Returns:</span></p></td> 239<td><p>A new expression node representing the function call operation.</p></td> 240</tr></tbody> 241</table></div> 242</li> 243<li class="listitem"> 244<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">></span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_33_5_9_1_1_2_14_12-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">...</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 245<p> 246 This is an overloaded member function, provided for convenience. It differs from 247 the above function only in what argument(s) it accepts. 248 </p> 249</li> 250</ol></div> 251</div> 252</div> 253</div> 254<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 255<td align="left"></td> 256<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 257 Distributed under the Boost Software License, Version 1.0. (See accompanying 258 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>) 259 </p> 260</div></td> 261</tr></table> 262<hr> 263<div class="spirit-nav"> 264<a accesskey="p" href="basic_expr.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.expr_hpp"><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="expr/result.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 265</div> 266</body> 267</html> 268
