regex_traits

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### regex_traits

    namespace boost{

    template <class charT, class implementationT = sensible_default_choice>
    struct regex_traits : public implementationT
    {
       regex_traits() : implementationT() {}
    };

    template <class charT>
    struct c_regex_traits;

    template <class charT>
    class cpp_regex_traits;

    template <class charT>
    class w32_regex_traits;

    } // namespace boost

##### Description

The class `regex_traits` is just a thin wrapper around an actual implemention class, which may be one of:

- `c_regex_traits`: 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.
- `cpp_regex_traits`: the default traits class for non-Win32 platforms, allows the regex class to be imbued with a std::locale instance.
- `w32_regex_traits`: the default traits class implementation on Win32 platforms, allows the regex class to be imbued with an LCID.

The default behavior can be altered by defining one of the following configuration macros in boost/regex/user.hpp

- BOOST_REGEX_USE_C_LOCALE: makes `c_regex_traits` the default.
- BOOST_REGEX_USE_CPP_LOCALE: makes `cpp_regex_traits` the default.

All these traits classes fulfil the traits class requirements.