forked from boostorg/fusion
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194 lines
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>>>>>>> .merge-right.r57125
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<link rel="home" href="../../index.html" title="Chapter 1. Fusion 2.0">
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<<<<<<< .working
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<div class="section" lang="en">
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<div class="titlepage">
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<div><div><h3 class="title">
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<a name="fusion.support.is_view"></a><a href="is_view.html" title="is_view">is_view</a>
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</h3></div></div>
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<div></div>
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</div>
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<a name="fusion.support.is_view.description"></a><h4>
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<a name="id413272"></a>
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<a href="is_view.html#fusion.support.is_view.description">Description</a>
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</h4>
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=======
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<div class="section" title="is_view">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="fusion.support.is_view"></a><a class="link" href="is_view.html" title="is_view">is_view</a>
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</h3></div></div></div>
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<a name="fusion.support.is_view.description"></a><h5>
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<a name="id613016"></a>
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<a class="link" href="is_view.html#fusion.support.is_view.description">Description</a>
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</h5>
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>>>>>>> .merge-right.r57125
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<p>
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Metafunction that evaluates to <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
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if a certain type <tt class="computeroutput"><span class="identifier">T</span></tt> is a
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conforming Fusion <a href="../view.html" title="View">View</a>, <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt>
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otherwise. A view is a specialized sequence that does not actually contain
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data. Views hold sequences which may be other views. In general, views are
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held by other views by value, while non-views are held by other views by
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reference. <tt class="computeroutput"><span class="identifier">is_view</span></tt> may be
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specialized to accomodate clients providing Fusion conforming views.
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</p>
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<<<<<<< .working
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<a name="fusion.support.is_view.synopsis"></a><h4>
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<a name="id413366"></a>
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<a href="is_view.html#fusion.support.is_view.synopsis">Synopsis</a>
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</h4>
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=======
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<a name="fusion.support.is_view.synopsis"></a><h5>
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<a name="id613080"></a>
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<a class="link" href="is_view.html#fusion.support.is_view.synopsis">Synopsis</a>
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</h5>
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>>>>>>> .merge-right.r57125
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<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">traits</span>
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<span class="special">{</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">is_view</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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<span class="special">}</span>
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</pre>
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<<<<<<< .working
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<a name="fusion.support.is_view.parameters"></a><h4>
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<a name="id413482"></a>
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<a href="is_view.html#fusion.support.is_view.parameters">Parameters</a>
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</h4>
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=======
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<a name="fusion.support.is_view.parameters"></a><h5>
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<a name="id613174"></a>
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<a class="link" href="is_view.html#fusion.support.is_view.parameters">Parameters</a>
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</h5>
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>>>>>>> .merge-right.r57125
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th><p>
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Parameter
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</p></th>
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<th><p>
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Requirement
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</p></th>
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<th><p>
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Description
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</p></th>
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</tr></thead>
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<tbody><tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">T</span></tt>
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</p></td>
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<td><p>
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Any type
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</p></td>
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<td><p>
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The type to query.
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</p></td>
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</tr></tbody>
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</table></div>
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<<<<<<< .working
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<a name="fusion.support.is_view.expression_semantics"></a><h4>
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<a name="id413581"></a>
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<a href="is_view.html#fusion.support.is_view.expression_semantics">Expression Semantics</a>
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</h4>
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=======
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<a name="fusion.support.is_view.expression_semantics"></a><h5>
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<a name="id613257"></a>
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<a class="link" href="is_view.html#fusion.support.is_view.expression_semantics">Expression Semantics</a>
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</h5>
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>>>>>>> .merge-right.r57125
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<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_view</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">c</span><span class="special">;</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
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Boolean Constant</a>.
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Metafunction that evaluates to
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<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt> if a certain type <tt class="computeroutput"><span class="identifier">T</span></tt>
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is a conforming Fusion view, <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt>
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otherwise.
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</p>
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<<<<<<< .working
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<a name="fusion.support.is_view.header"></a><h4>
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<a name="id413730"></a>
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<a href="is_view.html#fusion.support.is_view.header">Header</a>
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</h4>
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=======
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<a name="fusion.support.is_view.header"></a><h5>
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<a name="id613371"></a>
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<a class="link" href="is_view.html#fusion.support.is_view.header">Header</a>
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</h5>
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>>>>>>> .merge-right.r57125
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<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">is_view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<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">is_view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<<<<<<< .working
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<a name="fusion.support.is_view.example"></a><h4>
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<a name="id413867"></a>
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<a href="is_view.html#fusion.support.is_view.example">Example</a>
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</h4>
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=======
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<a name="fusion.support.is_view.example"></a><h5>
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<a name="id613479"></a>
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<a class="link" href="is_view.html#fusion.support.is_view.example">Example</a>
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</h5>
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>>>>>>> .merge-right.r57125
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<pre class="programlisting"><span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_view</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="special">></span> <span class="special">));</span>
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<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_view</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="special">));</span>
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<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">_</span>
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<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_pointer</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">*,</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">long</span><span class="special">*,</span> <span class="keyword">bool</span><span class="special">,</span> <span class="keyword">double</span><span class="special">></span> <span class="identifier">vector_type</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../view/filter_view.html" title="filter_view"><tt class="computeroutput"><span class="identifier">filter_view</span></tt></a><span class="special"><</span><span class="identifier">vector_type</span><span class="special">,</span> <span class="identifier">is_pointer</span><span class="special"><</span><span class="identifier">_</span><span class="special">></span> <span class="special">></span> <span class="identifier">filter_view_type</span><span class="special">;</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_view</span><span class="special"><</span><span class="identifier">filter_view_type</span><span class="special">></span> <span class="special">));</span>
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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