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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="fusion.support.deduce"></a><a class="link" href="deduce.html" title="deduce">deduce</a> |
| </h3></div></div></div> |
| <a name="fusion.support.deduce.description"></a><h5> |
| <a name="id840005"></a> |
| <a class="link" href="deduce.html#fusion.support.deduce.description">Description</a> |
| </h5> |
| <p> |
| Metafunction to apply <a class="link" href="../notes.html#fusion.notes.element_conversion"><span class="emphasis"><em>element |
| conversion</em></span></a> to the full argument type. |
| </p> |
| <p> |
| It removes references to <code class="computeroutput"><span class="keyword">const</span></code>, |
| references to array types are kept, even if the array is <code class="computeroutput"><span class="keyword">const</span></code>. |
| Reference wrappers are removed (see <a class="link" href="../notes.html#fusion.notes.boost__ref"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">ref</span></code></a>). |
| </p> |
| <a name="fusion.support.deduce.header"></a><h5> |
| <a name="id840062"></a> |
| <a class="link" href="deduce.html#fusion.support.deduce.header">Header</a> |
| </h5> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">support</span><span class="special">/</span><span class="identifier">deduce</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">deduce</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <a name="fusion.support.deduce.synopsis"></a><h5> |
| <a name="id840170"></a> |
| <a class="link" href="deduce.html#fusion.support.deduce.synopsis">Synopsis</a> |
| </h5> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">traits</span> |
| <span class="special">{</span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">deduce</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span> |
| <span class="special">};</span> |
| <span class="special">}</span> |
| </pre> |
| <a name="fusion.support.deduce.example"></a><h5> |
| <a name="id840264"></a> |
| <a class="link" href="deduce.html#fusion.support.deduce.example">Example</a> |
| </h5> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">holder</span> |
| <span class="special">{</span> |
| <span class="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">deduce</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&>::</span><span class="identifier">type</span> <span class="identifier">element</span><span class="special">;</span> |
| |
| <span class="identifier">holder</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a</span><span class="special">)</span> |
| <span class="special">:</span> <span class="identifier">element</span><span class="special">(</span><span class="identifier">a</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="identifier">T</span><span class="special">></span> |
| <span class="identifier">holder</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">make_holder</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="identifier">holder</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">a</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| <a name="fusion.support.deduce.see_also"></a><h5> |
| <a name="id840532"></a> |
| <a class="link" href="deduce.html#fusion.support.deduce.see_also">See also</a> |
| </h5> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <a class="link" href="deduce_sequence.html" title="deduce_sequence"><code class="computeroutput"><span class="identifier">deduce_sequence</span></code></a> |
| </li></ul></div> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias |
| Schwinger<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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