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<title>Struct template literal</title>
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<div class="refentry">
<a name="boost.proto.literal"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template literal</span></h2>
<p>boost::proto::literal — A simple wrapper for a terminal, provided for ease of use.</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.literal_hpp" title="Header <boost/proto/literal.hpp>">boost/proto/literal.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../Domain.html" title="Concept Domain">Domain</a> <span class="special">=</span> <a class="link" href="default_domain.html" title="Struct default_domain">proto::default_domain</a><span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="literal.html" title="Struct template literal">literal</a> <span class="special">:</span> <span class="keyword"></span>
<a class="link" href="extends.html" title="Struct template extends">proto::extends</a><span class="special"><</span><a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><span class="special"><</span><a class="link" href="tag/terminal.html" title="Struct terminal">proto::tag::terminal</a><span class="special">,</span> <a class="link" href="term.html" title="Struct template term">proto::term</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">></span><span class="special">,</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">literal</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">></span><span class="special">,</span> <span class="identifier">Domain</span><span class="special">></span>
<span class="special">{</span>
<span class="comment">// types</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><a class="link" href="tag/terminal.html" title="Struct terminal">proto::tag::terminal</a><span class="special">,</span> <a class="link" href="term.html" title="Struct template term">proto::term</a><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">></span> <a name="boost.proto.literal.X"></a><span class="identifier">X</span><span class="special">;</span> <span class="comment">// For exposition only</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="link" href="result_of/value.html" title="Struct template value">proto::result_of::value</a><span class="special"><</span><span class="identifier">X</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.literal.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="link" href="result_of/value.html" title="Struct template value">proto::result_of::value</a><span class="special"><</span><span class="identifier">X</span> <span class="special">&</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.literal.reference"></a><span class="identifier">reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="link" href="result_of/value.html" title="Struct template value">proto::result_of::value</a><span class="special"><</span><span class="identifier">X</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.proto.literal.const_reference"></a><span class="identifier">const_reference</span><span class="special">;</span>
<span class="comment">// <a class="link" href="literal.html#boost.proto.literalconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="literal.html#id1525849-bb"><span class="identifier">literal</span></a><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> U<span class="special">></span> <a class="link" href="literal.html#id1525852-bb"><span class="identifier">literal</span></a><span class="special">(</span><span class="identifier">U</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> U<span class="special">></span> <a class="link" href="literal.html#id1525873-bb"><span class="identifier">literal</span></a><span class="special">(</span><span class="identifier">U</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> U<span class="special">></span> <a class="link" href="literal.html#id1525895-bb"><span class="identifier">literal</span></a><span class="special">(</span><a class="link" href="literal.html" title="Struct template literal">proto::literal</a><span class="special"><</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">Domain</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="literal.html#id1525802-bb">public member functions</a></span>
<span class="identifier">reference</span> <a class="link" href="literal.html#id1525807-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">const_reference</span> <a class="link" href="literal.html#id1525826-bb"><span class="identifier">get</span></a><span class="special">(</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="id2802417"></a><h2>Description</h2>
<p>
A simple wrapper for a terminal, provided for ease of use. In all cases,
<code class="computeroutput">proto::literal<X> l(x);</code> is equivalent to
<code class="computeroutput"><a class="link" href="terminal.html" title="Struct template terminal">proto::terminal</a><X>::type l = {x};</code>.
</p>
<p>
The <code class="computeroutput">Domain</code> template parameter defaults to
<code class="computeroutput"><a class="link" href="default_domain.html" title="Struct default_domain">proto::default_domain</a></code>.
</p>
<div class="refsect2">
<a name="id2802467"></a><h3>
<a name="boost.proto.literalconstruct-copy-destruct"></a><code class="computeroutput">literal</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="id1525849-bb"></a><span class="identifier">literal</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="id1525852-bb"></a><span class="identifier">literal</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&</span> u<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="id1525873-bb"></a><span class="identifier">literal</span><span class="special">(</span><span class="identifier">U</span> <span class="keyword">const</span> <span class="special">&</span> u<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="id1525895-bb"></a><span class="identifier">literal</span><span class="special">(</span><a class="link" href="literal.html" title="Struct template literal">proto::literal</a><span class="special"><</span> <span class="identifier">U</span><span class="special">,</span> <span class="identifier">Domain</span> <span class="special">></span> <span class="keyword">const</span> <span class="special">&</span> u<span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2802735"></a><h3>
<a name="id1525802-bb"></a><code class="computeroutput">literal</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">reference</span> <a name="id1525807-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><code class="computeroutput"><a class="link" href="value_id1551456.html" title="Function value">proto::value</a>(*this)</code></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">const_reference</span> <a name="id1525826-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><code class="computeroutput"><a class="link" href="value_id1551456.html" title="Function value">proto::value</a>(*this)</code></td>
</tr></tbody>
</table></div>
</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>
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