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<div class="refentry">
<a name="boost.proto.expr"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template expr</span></h2>
<p>boost::proto::expr — Representation of a node in an expression tree.</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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>>
</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>
<span class="keyword">struct</span> <a class="link" href="expr.html" title="Struct template expr">expr</a> <span class="special">{</span>
<span class="comment">// types</span>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<span class="comment">// member classes/structs/unions</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Signature<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="expr/result.html" title="Struct template result">result</a> <span class="special">{</span>
<span class="comment">// types</span>
<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>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="expr.html#idp700615328-bb">public static functions</a></span>
<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#idp700616208-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>
<span class="comment">// <a class="link" href="expr.html#idp700623312-bb">public member functions</a></span>
<span class="identifier">expr</span> <span class="special">&</span> <a class="link" href="expr.html#idp700623872-bb"><span class="identifier">proto_base</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">expr</span> <span class="keyword">const</span> <span class="special">&</span> <a class="link" href="expr.html#idp700625744-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>
<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#idp700628528-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>
<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#idp700633856-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>
<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#idp700638400-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>
<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#idp700643216-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>
<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#idp700648352-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>
<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#idp700653680-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">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#idp700658224-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>
<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#idp700663040-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>
<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#idp700668176-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>
<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#idp700674032-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>
<span class="comment">// public data members</span>
<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>
<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>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp462784144"></a><h2>Description</h2>
<p>
<code class="computeroutput">proto::expr<></code> is a node in an expression
template tree. It is a container for its child sub-trees. It also serves as the
terminal nodes of the tree.
</p>
<p>
<code class="computeroutput">Tag</code> is type that represents the operation
encoded by this expression. It is typically one of the structs in the
<code class="computeroutput">boost::proto::tag</code> namespace, but it doesn't
have to be. If <code class="computeroutput">Arity</code> is 0 then this
<code class="computeroutput">expr<></code> type represents a leaf in the
expression tree.
</p>
<p>
<code class="computeroutput">Args</code> is a list of types representing
the children of this expression. It is an instantiation of one of
<code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::list1<></a></code>,
<code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::list2<></a></code>,
etc. The child types
must all themselves be either <code class="computeroutput">proto::expr<></code>
or <code class="computeroutput">proto::basic_expr<>&</code> (or extensions thereof via
<code class="computeroutput"><a class="link" href="extends.html" title="Struct template extends">proto::extends<></a></code> or
<code class="computeroutput"><a class="link" href="../../BOOST_PROTO_EXTENDS.html" title="Macro BOOST_PROTO_EXTENDS">BOOST_PROTO_EXTENDS</a>()</code>), unless
<code class="computeroutput">Arity</code> is 0, in which case
<code class="computeroutput">Args</code> must be
<code class="computeroutput">proto::term<T></code>, where
<code class="computeroutput">T</code> can be any type.
</p>
<p>
<code class="computeroutput">proto::expr<></code> is a valid Fusion
random-access sequence, where the elements of the sequence are the child
expressions.
</p>
<div class="refsect2">
<a name="idp462801440"></a><h3>
<a name="idp700615328-bb"></a><code class="computeroutput">expr</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<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="idp700616208-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>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>
The number of supplied arguments must be <code class="computeroutput">max(Arity,1)</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
A new <code class="computeroutput">expr</code> object initialized with the specified arguments.
</p></td>
</tr>
</tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="idp462818720"></a><h3>
<a name="idp700623312-bb"></a><code class="computeroutput">expr</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">expr</span> <span class="special">&</span> <a name="idp700623872-bb"></a><span class="identifier">proto_base</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">*this</code></p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">expr</span> <span class="keyword">const</span> <span class="special">&</span> <a name="idp700625744-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>
<p>This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.</p>
</li>
<li class="listitem">
<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="idp700628528-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>
<p>Lazy assignment expression</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A new expression node representing the assignment operation.</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<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="idp700633856-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
<li class="listitem">
<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="idp700638400-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
<li class="listitem">
<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="idp700643216-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
<li class="listitem">
<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="idp700648352-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>
<p>Lazy subscript expression</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A new expression node representing the subscript operation.</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<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="idp700653680-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
<li class="listitem">
<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="idp700658224-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
<li class="listitem">
<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="idp700663040-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
<li class="listitem">
<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="idp700668176-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>
<p>Lazy function call</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A new expression node representing the function call operation.</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<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="idp700674032-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>
<p>
This is an overloaded member function, provided for convenience. It differs from
the above function only in what argument(s) it accepts.
</p>
</li>
</ol></div>
</div>
</div>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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>)
</p>
</div></td>
</tr></table>
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