ceph/src/boost/libs/xpressive/include/boost/xpressive/detail/utility/literals.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // literals.hpp
   3 //
   4 //  Copyright 2008 Eric Niebler. Distributed under the Boost
   5 //  Software License, Version 1.0. (See accompanying file
   6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_LITERALS_HPP_EAN_10_04_2005
   9 #define BOOST_XPRESSIVE_DETAIL_UTILITY_LITERALS_HPP_EAN_10_04_2005
  10
  11 // MS compatible compilers support #pragma once
  12 #if defined(_MSC_VER)
  13 # pragma once
  14 #endif
  15
  16 #include <boost/config.hpp> // for BOOST_STATIC_CONSTANT
  17 #include <boost/cstdint.hpp> // for BOOST_STATIC_CONSTANT
  18 #include <boost/detail/workaround.hpp>
  19
  20 namespace boost { namespace xpressive { namespace detail
  21 {
  22
  23 ///////////////////////////////////////////////////////////////////////////////
  24 // char_literal
  25 //
  26 template<typename Char, boost::intmax_t Ch, boost::intmax_t Wch>
  27 struct char_literal;
  28
  29 template<typename Char, boost::intmax_t Ch>
  30 struct char_literal<Char, Ch, Ch>
  31 {
  32     BOOST_STATIC_CONSTANT(boost::intmax_t, value = Ch);
  33 };
  34
  35 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
  36 template<typename Char, boost::intmax_t Ch>
  37 boost::intmax_t const char_literal<Char, Ch, Ch>::value;
  38 #endif
  39
  40 template<typename Ch>
  41 struct string_literal;
  42
  43 template<>
  44 struct string_literal<char>
  45 {
  46     static BOOST_CONSTEXPR char const *pick(char const *cstr, wchar_t const *)
  47     {
  48         return cstr;
  49     }
  50
  51     static BOOST_CONSTEXPR char pick(char ch, wchar_t)
  52     {
  53         return ch;
  54     }
  55 };
  56
  57 template<>
  58 struct string_literal<wchar_t>
  59 {
  60     static BOOST_CONSTEXPR wchar_t const *pick(char const *, wchar_t const *cstr)
  61     {
  62         return cstr;
  63     }
  64
  65     static BOOST_CONSTEXPR wchar_t pick(char, wchar_t ch)
  66     {
  67         return ch;
  68     }
  69 };
  70
  71 #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3206))
  72
  73 # define BOOST_XPR_CHAR_(Char, ch) ch
  74 # define BOOST_XPR_CSTR_(Char, st) boost::xpressive::detail::string_literal<Char>::pick(st, L##st)
  75
  76 #else
  77
  78 # define BOOST_XPR_CHAR_(Char, ch) boost::xpressive::detail::char_literal<Char, ch, L##ch>::value
  79 # define BOOST_XPR_CSTR_(Char, st) boost::xpressive::detail::string_literal<Char>::pick(st, L##st)
  80
  81 #endif
  82
  83 }}} // namespace boost::xpressive::detail
  84
  85 #endif