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<a name="boost.proto.functional.display_expr"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct display_expr</span></h2>
<p>boost::proto::functional::display_expr &#8212; Pretty-print a Proto expression tree. </p>
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<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: &lt;<a class="link" href="../../../proto/reference.html#header.boost.proto.debug_hpp" title="Header &lt;boost/proto/debug.hpp&gt;">boost/proto/debug.hpp</a>&gt;
</span>
<span class="keyword">struct</span> <a class="link" href="display_expr.html" title="Struct display_expr">display_expr</a> <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="keyword">void</span> <a name="boost.proto.functional.display_expr.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="display_expr.html#boost.proto.functional.display_exprconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="display_expr.html#id1256730-bb"><span class="identifier">display_expr</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span> <span class="special">&amp;</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="display_expr.html#id1256694-bb">public member functions</a></span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="display_expr.html#id1256699-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2270605"></a><h2>Description</h2>
<p>
A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> which accepts a Proto expression tree and pretty-prints it to an <code class="computeroutput">ostream</code> for debugging purposes.
</p>
<div class="refsect2">
<a name="id2270629"></a><h3>
<a name="boost.proto.functional.display_exprconstruct-copy-destruct"></a><code class="computeroutput">display_expr</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="id1256730-bb"></a><span class="identifier">display_expr</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span> <span class="special">&amp;</span> sout <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">,</span> <span class="keyword">int</span> depth <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
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<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">depth</code></span></p></td>
<td><p>
The starting indentation depth for this node. Children nodes will be displayed at a starting depth of <code class="computeroutput">depth+4</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">sout</code></span></p></td>
<td><p>
The <code class="computeroutput">ostream</code> to which the expression tree will be written.
</p></td>
</tr>
</tbody>
</table></div></td>
</tr></tbody>
</table></div>
</li></ol></div>
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<div class="refsect2">
<a name="id2270788"></a><h3>
<a name="id1256694-bb"></a><code class="computeroutput">display_expr</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> <span class="keyword">void</span> <a name="id1256699-bb"></a><span class="keyword">operator</span><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">&amp;</span> expr<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li></ol></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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>)
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