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<title>charT Requirements</title>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_regex.ref.concepts.charT_concept"></a><a class="link" href="charT_concept.html" title="charT Requirements">charT Requirements</a>
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</h4></div></div></div>
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<p>
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Type <code class="computeroutput"><span class="identifier">charT</span></code> used a template
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argument to class template <a class="link" href="../basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>, must have a trivial
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default constructor, copy constructor, assignment operator, and destructor.
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In addition the following requirements must be met for objects; <span class="emphasis"><em>c</em></span>
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of type <code class="computeroutput"><span class="identifier">charT</span></code>, <span class="emphasis"><em>c1</em></span>
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and <span class="emphasis"><em>c2</em></span> of type <code class="computeroutput"><span class="identifier">charT</span>
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<span class="keyword">const</span></code>, and <span class="emphasis"><em>i</em></span>
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of type <code class="computeroutput"><span class="keyword">int</span></code>:
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<thead><tr>
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<p>
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Expression
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</p>
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</th>
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<p>
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Return type
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<p>
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Assertion / Note / Pre- / Post-condition
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</p>
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</tr></thead>
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<tbody>
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<p>
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charT c
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</p>
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</td>
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<td>
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<p>
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charT
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</p>
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</td>
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<td>
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<p>
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Default constructor (must be trivial).
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</p>
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</td>
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<tr>
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<td>
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<p>
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charT c(c1)
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</p>
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</td>
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<td>
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<p>
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charT
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</p>
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</td>
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<td>
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<p>
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Copy constructor (must be trivial).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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c1 = c2
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</p>
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</td>
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<td>
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charT
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</p>
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</td>
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Assignment operator (must be trivial).
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</p>
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</td>
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<tr>
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<p>
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c1 == c2
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</td>
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bool
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true if c1 has the same value as c2.
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</p>
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<p>
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c1 != c2
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bool
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true if c1 and c2 are not equal.
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<p>
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c1 < c2
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bool
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</p>
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true if the value of c1 is less than c2.
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</p>
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</td>
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<td>
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<p>
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c1 > c2
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</p>
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<p>
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bool
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</p>
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</td>
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<p>
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true if the value of c1 is greater than c2.
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</p>
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</td>
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</tr>
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<p>
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c1 <= c2
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</p>
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</td>
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<td>
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<p>
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bool
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</p>
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</td>
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<td>
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<p>
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true if c1 is less than or equal to c2.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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c1 >= c2
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</p>
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</td>
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<td>
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<p>
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bool
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</p>
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</td>
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<td>
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<p>
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true if c1 is greater than or equal to c2.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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intmax_t i = c1
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</p>
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</td>
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<td>
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<p>
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int
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</p>
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</td>
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<td>
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<p>
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charT must be convertible to an integral type.
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</p>
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<p>
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Note: type charT is not required to support this operation, if
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the traits class used supports the full Boost-specific interface,
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rather than the minimal standardised-interface (see traits class
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requirements below).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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charT c(i);
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</p>
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</td>
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<td>
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<p>
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charT
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</p>
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</td>
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<td>
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<p>
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charT must be constructable from an integral type.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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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 © 1998-2013 John Maddock<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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