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| <h2><span class="refentrytitle">Macro BOOST_PROTO_AUTO</span></h2> |
| <p>BOOST_PROTO_AUTO — For defining a local variable that stores a Proto expression template, |
| deep-copying the expression so there are no dangling references.</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.proto_typeof_hpp" title="Header <boost/proto/proto_typeof.hpp>">boost/proto/proto_typeof.hpp</a>> |
| |
| </span>BOOST_PROTO_AUTO(Var, Expr)</pre></div> |
| <div class="refsect1"> |
| <a name="id2354257"></a><h2>Description</h2> |
| <p> |
| To define a local variable <code class="computeroutput">ex</code> that stores the expression |
| <code class="computeroutput"><a class="link" href="boost/proto/lit.html" title="Function lit">proto::lit</a>(1) + 2</code>, |
| do the following:</p> |
| <pre class="programlisting"><span class="identifier">BOOST_PROTO_AUTO</span><span class="special">(</span> <span class="identifier">ex</span><span class="special">,</span> <a class="link" href="boost/proto/lit.html" title="Function lit">proto::lit</a><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">+</span> <span class="number">2</span> <span class="special">)</span><span class="special">;</span></pre> |
| <p>. |
| The above is equivalent to the following: |
| </p> |
| <pre class="programlisting"><span class="identifier">BOOST_AUTO</span><span class="special">(</span> <span class="identifier">ex</span><span class="special">,</span> <a class="link" href="boost/proto/deep_copy_id1257673.html" title="Function template deep_copy">proto::deep_copy</a><span class="special">(</span> <a class="link" href="boost/proto/lit.html" title="Function lit">proto::lit</a><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">+</span> <span class="number">2</span> <span class="special">)</span> <span class="special">)</span><span class="special">;</span></pre> |
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| <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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