boost/regex/v5/regex_traits.hpp

/*
 *
 * Copyright (c) 2003
 * John Maddock
 *
 * Use, modification and distribution are subject to the 
 * Boost Software License, Version 1.0. (See accompanying file 
 * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 *
 */
 
 /*
  *   LOCATION:    see http://www.boost.org for most recent version.
  *   FILE         regex_traits.hpp
  *   VERSION      see <boost/version.hpp>
  *   DESCRIPTION: Declares regular expression traits classes.
  */

#ifndef BOOST_REGEX_TRAITS_HPP_INCLUDED
#define BOOST_REGEX_TRAITS_HPP_INCLUDED

#include <boost/regex/config.hpp>
#include <boost/regex/v5/regex_workaround.hpp>
#include <boost/regex/v5/syntax_type.hpp>
#include <boost/regex/v5/error_type.hpp>
#include <boost/regex/v5/regex_traits_defaults.hpp>
#include <boost/regex/v5/cpp_regex_traits.hpp>
#include <boost/regex/v5/c_regex_traits.hpp>
#if defined(_WIN32) && !defined(BOOST_REGEX_NO_W32)
#     include <boost/regex/v5/w32_regex_traits.hpp>
#endif
#include <boost/regex_fwd.hpp>

namespace boost{

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

//
// class regex_traits_wrapper.
// this is what our implementation will actually store;
// it provides default implementations of the "optional"
// interfaces that we support, in addition to the
// required "standard" ones:
//
namespace BOOST_REGEX_DETAIL_NS{

   template <class T>
   struct has_boost_extensions_tag
   {
      template <class U>
      static double checker(U*, typename U::boost_extensions_tag* = nullptr);
      static char   checker(...);
      static T* get();

      static const bool value = sizeof(checker(get())) > 1;
   };
   

template <class BaseT>
struct default_wrapper : public BaseT
{
   typedef typename BaseT::char_type char_type;
   std::string error_string(::boost::regex_constants::error_type e)const
   {
      return ::boost::BOOST_REGEX_DETAIL_NS::get_default_error_string(e);
   }
   ::boost::regex_constants::syntax_type syntax_type(char_type c)const
   {
      return (char_type(c & 0x7f) == c) ? get_default_syntax_type(static_cast<char>(c)) : ::boost::regex_constants::syntax_char;
   }
   ::boost::regex_constants::escape_syntax_type escape_syntax_type(char_type c)const
   {
      return (char_type(c & 0x7f) == c) ? get_default_escape_syntax_type(static_cast<char>(c)) : ::boost::regex_constants::escape_type_identity;
   }
   std::intmax_t toi(const char_type*& p1, const char_type* p2, int radix)const
   {
      return ::boost::BOOST_REGEX_DETAIL_NS::global_toi(p1, p2, radix, *this);
   }
   char_type translate(char_type c, bool icase)const
   {
      return (icase ? this->translate_nocase(c) : this->translate(c));
   }
   char_type translate(char_type c)const
   {
      return BaseT::translate(c);
   }
   char_type tolower(char_type c)const
   {
      return ::boost::BOOST_REGEX_DETAIL_NS::global_lower(c);
   }
   char_type toupper(char_type c)const
   {
      return ::boost::BOOST_REGEX_DETAIL_NS::global_upper(c);
   }
};

template <class BaseT, bool has_extensions>
struct compute_wrapper_base
{
   typedef BaseT type;
};
template <class BaseT>
struct compute_wrapper_base<BaseT, false>
{
   typedef default_wrapper<BaseT> type;
};

} // namespace BOOST_REGEX_DETAIL_NS

template <class BaseT>
struct regex_traits_wrapper 
   : public ::boost::BOOST_REGEX_DETAIL_NS::compute_wrapper_base<
               BaseT, 
               ::boost::BOOST_REGEX_DETAIL_NS::has_boost_extensions_tag<BaseT>::value
            >::type
{
   regex_traits_wrapper(){}
private:
   regex_traits_wrapper(const regex_traits_wrapper&);
   regex_traits_wrapper& operator=(const regex_traits_wrapper&);
};

} // namespace boost

#endif // include
Boost C++ Libraries

boost/regex/v5/regex_traits.hpp
