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| <a name="boost.proto.functional.as_env"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Struct as_env</span></h2> |
| <p>boost::proto::functional::as_env — |
| A unary <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> for ensuring that an object |
| is a transform environment. If it isn't already, it is turned into one such that the |
| object is associated with the <a class="link" href="../data_type.html" title="Struct data_type">proto::data_type</a> key. |
| </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: <<a class="link" href="../../../proto/reference.html#header.boost.proto.transform.env_hpp" title="Header <boost/proto/transform/env.hpp>">boost/proto/transform/env.hpp</a>> |
| |
| </span> |
| <span class="keyword">struct</span> <a class="link" href="as_env.html" title="Struct as_env">as_env</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../callable.html" title="Struct callable">proto::callable</a> <span class="special">{</span> |
| <span class="comment">// member classes/structs/unions</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sig<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="as_env/result.html" title="Struct template result">result</a> <span class="special">{</span> |
| <span class="comment">// <a class="link" href="as_env/result.html#boost.proto.functional.as_env.resulttypes">types</a></span> |
| <span class="keyword">typedef</span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a class="link" href="as_env/result.html#boost.proto.functional.as_env.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="as_env.html#idp202558096-bb">public member functions</a></span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a class="link" href="as_env.html#idp202559216-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">T</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> T<span class="special">></span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a class="link" href="as_env.html#idp202562688-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">T</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="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="idp381634224"></a><h2>Description</h2> |
| <div class="refsect2"> |
| <a name="idp381634640"></a><h3> |
| <a name="idp202558096-bb"></a><code class="computeroutput">as_env</code> public member functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> |
| <pre class="literallayout"><a name="idp202558656-bb"></a><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a name="idp202559216-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">T</span> <span class="special">&</span> t<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> T<span class="special">></span> <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a name="idp202562688-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> t<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> |
| <p> |
| If <code class="computeroutput"><a class="link" href="../is_env.html" title="Struct template is_env">proto::is_env</a><T>::value</code> is <code class="computeroutput">false</code>, |
| this function returns the result of <code class="computeroutput">(<a class="link" href="../data.html" title="Global data">proto::data</a> = t)</code>. |
| See <code class="computeroutput"><a class="link" href="../data_type.html#idp202528944-bb">proto::data_type::operator=</a></code> for details. |
| </p> |
| <p> |
| Otherwise, this function returns <code class="computeroutput">t</code> by reference. |
| </p> |
| </li></ol></div> |
| </div> |
| </div> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <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>) |
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