Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // literals.hpp
Chris@16: //
Chris@16: //  Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16: //  Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_LITERALS_HPP_EAN_10_04_2005
Chris@16: #define BOOST_XPRESSIVE_DETAIL_UTILITY_LITERALS_HPP_EAN_10_04_2005
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@101: #if defined(_MSC_VER)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp> // for BOOST_STATIC_CONSTANT
Chris@16: #include <boost/cstdint.hpp> // for BOOST_STATIC_CONSTANT
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: namespace boost { namespace xpressive { namespace detail
Chris@16: {
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // char_literal
Chris@16: //
Chris@16: template<typename Char, boost::intmax_t Ch, boost::intmax_t Wch>
Chris@16: struct char_literal;
Chris@16: 
Chris@16: template<typename Char, boost::intmax_t Ch>
Chris@16: struct char_literal<Char, Ch, Ch>
Chris@16: {
Chris@16:     BOOST_STATIC_CONSTANT(boost::intmax_t, value = Ch);
Chris@16: };
Chris@16: 
Chris@16: #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
Chris@16: template<typename Char, boost::intmax_t Ch>
Chris@16: boost::intmax_t const char_literal<Char, Ch, Ch>::value;
Chris@16: #endif
Chris@16: 
Chris@16: template<typename Ch>
Chris@16: struct string_literal;
Chris@16: 
Chris@16: template<>
Chris@16: struct string_literal<char>
Chris@16: {
Chris@16:     static BOOST_CONSTEXPR char const *pick(char const *cstr, wchar_t const *)
Chris@16:     {
Chris@16:         return cstr;
Chris@16:     }
Chris@16: 
Chris@16:     static BOOST_CONSTEXPR char pick(char ch, wchar_t)
Chris@16:     {
Chris@16:         return ch;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct string_literal<wchar_t>
Chris@16: {
Chris@16:     static BOOST_CONSTEXPR wchar_t const *pick(char const *, wchar_t const *cstr)
Chris@16:     {
Chris@16:         return cstr;
Chris@16:     }
Chris@16: 
Chris@16:     static BOOST_CONSTEXPR wchar_t pick(char, wchar_t ch)
Chris@16:     {
Chris@16:         return ch;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3206))
Chris@16: 
Chris@16: # define BOOST_XPR_CHAR_(Char, ch) ch
Chris@16: # define BOOST_XPR_CSTR_(Char, st) boost::xpressive::detail::string_literal<Char>::pick(st, L##st)
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: # define BOOST_XPR_CHAR_(Char, ch) boost::xpressive::detail::char_literal<Char, ch, L##ch>::value
Chris@16: # define BOOST_XPR_CSTR_(Char, st) boost::xpressive::detail::string_literal<Char>::pick(st, L##st)
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: }}} // namespace boost::xpressive::detail
Chris@16: 
Chris@16: #endif