71 lines
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71 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.can_query"></a><a class="link" href="can_query.html" title="can_query">can_query</a>
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<p>
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<a class="indexterm" name="boost_asio.indexterm.can_query"></a>
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</p>
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<p>
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A type trait that determines whether a <code class="computeroutput">query</code> expression is well-formed.
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</p>
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<pre class="programlisting">template<
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typename T,
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typename Property>
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struct can_query
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</pre>
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<p>
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Class template <code class="computeroutput">can_query</code> is a trait that is derived from <code class="computeroutput">true_type</code>
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if the expression <code class="computeroutput">boost::asio::query(std::declval<T>(), std::declval<Property>())</code>
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is well formed; otherwise <code class="computeroutput">false_type</code>.
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<a name="boost_asio.reference.can_query.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.can_query.requirements"></a></span><a class="link" href="can_query.html#boost_asio.reference.can_query.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/query.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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M. Kohlhoff<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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