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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_regex.ref.regex_traits"></a><a class="link" href="regex_traits.html" title="regex_traits">regex_traits</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">implementationT</span> <span class="special">=</span> <span class="identifier">sensible_default_choice</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">regex_traits</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">implementationT</span>
<span class="special">{</span>
   <span class="identifier">regex_traits</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">implementationT</span><span class="special">()</span> <span class="special">{}</span>
<span class="special">};</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">c_regex_traits</span><span class="special">;</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">cpp_regex_traits</span><span class="special">;</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">w32_regex_traits</span><span class="special">;</span>

<span class="special">}</span> <span class="comment">// namespace boost</span>
</pre>
<h5>
<a name="boost_regex.ref.regex_traits.h0"></a>
        <span class="phrase"><a name="boost_regex.ref.regex_traits.description"></a></span><a class="link" href="regex_traits.html#boost_regex.ref.regex_traits.description">Description</a>
      </h5>
<p>
        The class <code class="computeroutput"><span class="identifier">regex_traits</span></code> is
        just a thin wrapper around an actual implementation class, which may be one
        of:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <code class="computeroutput"><span class="identifier">c_regex_traits</span></code>: this
            class is deprecated, it wraps the C locale, and is used as the default
            implementation when the platform is not Win32, and the C++ locale is
            not available.
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">cpp_regex_traits</span></code>: the
            default traits class for non-Win32 platforms, allows the regex class
            to be imbued with a std::locale instance.
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">w32_regex_traits</span></code>: the
            default traits class implementation on Win32 platforms, allows the regex
            class to be imbued with an LCID.
          </li>
</ul></div>
<p>
        The default behavior can be altered by defining one of the following configuration
        macros in <a href="../../../../../../boost/regex/user.hpp" target="_top">boost/regex/user.hpp</a>
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            BOOST_REGEX_USE_C_LOCALE: makes <code class="computeroutput"><span class="identifier">c_regex_traits</span></code>
            the default.
          </li>
<li class="listitem">
            BOOST_REGEX_USE_CPP_LOCALE: makes <code class="computeroutput"><span class="identifier">cpp_regex_traits</span></code>
            the default.
          </li>
</ul></div>
<p>
        All these traits classes fulfil the <a class="link" href="concepts/traits_concept.html" title="Traits Class Requirements">traits
        class requirements</a>.
      </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<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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