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| <h2><span class="refentrytitle">Function flatten</span></h2> |
| <p>boost::proto::flatten — A function that returns a "flattened" view of 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: <<a class="link" href="../../proto/reference.html#header.boost.proto.fusion_hpp" title="Header <boost/proto/fusion.hpp>">boost/proto/fusion.hpp</a>> |
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| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> |
| <span class="keyword">typename</span> <a class="link" href="result_of/flatten.html" title="Struct template flatten">proto::result_of::flatten</a><span class="special"><</span> <span class="identifier">Expr</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span> <span class="identifier">flatten</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span> expr<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> |
| <span class="keyword">typename</span> <a class="link" href="result_of/flatten.html" title="Struct template flatten">proto::result_of::flatten</a><span class="special"><</span> <span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <span class="keyword">const</span> |
| <span class="identifier">flatten</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span> expr<span class="special">)</span><span class="special">;</span></pre></div> |
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| <a name="id2294157"></a><h2>Description</h2> |
| <p> |
| For a tree with a top-most node tag of type <code class="computeroutput">T</code>, the elements |
| of the flattened sequence are determined by recursing into each child node with the same tag |
| type and returning those nodes of different type. So for instance, the Proto expression tree |
| corresponding to the expression <code class="computeroutput">a | b | c</code> has a flattened |
| view with elements [a, b, c], even though the tree is grouped as |
| <code class="computeroutput">((a | b) | c)</code>. |
| </p> |
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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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