/////////////////////////////////////////////////////////////////////////////// | |
// literals.hpp | |
// | |
// Copyright 2008 Eric Niebler. Distributed under 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) | |
#ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_LITERALS_HPP_EAN_10_04_2005 | |
#define BOOST_XPRESSIVE_DETAIL_UTILITY_LITERALS_HPP_EAN_10_04_2005 | |
// MS compatible compilers support #pragma once | |
#if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
# pragma once | |
#endif | |
#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT | |
#include <boost/cstdint.hpp> // for BOOST_STATIC_CONSTANT | |
#include <boost/detail/workaround.hpp> | |
namespace boost { namespace xpressive { namespace detail | |
{ | |
/////////////////////////////////////////////////////////////////////////////// | |
// char_literal | |
// | |
template<typename Char, boost::intmax_t Ch, boost::intmax_t Wch> | |
struct char_literal; | |
template<typename Char, boost::intmax_t Ch> | |
struct char_literal<Char, Ch, Ch> | |
{ | |
BOOST_STATIC_CONSTANT(boost::intmax_t, value = Ch); | |
}; | |
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION | |
template<typename Char, boost::intmax_t Ch> | |
boost::intmax_t const char_literal<Char, Ch, Ch>::value; | |
#endif | |
template<typename Ch> | |
struct string_literal; | |
template<> | |
struct string_literal<char> | |
{ | |
static char const *pick(char const *cstr, wchar_t const *) | |
{ | |
return cstr; | |
} | |
static char pick(char ch, wchar_t) | |
{ | |
return ch; | |
} | |
}; | |
template<> | |
struct string_literal<wchar_t> | |
{ | |
static wchar_t const *pick(char const *, wchar_t const *cstr) | |
{ | |
return cstr; | |
} | |
static wchar_t pick(char, wchar_t ch) | |
{ | |
return ch; | |
} | |
}; | |
#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3206)) | |
# define BOOST_XPR_CHAR_(Char, ch) ch | |
# define BOOST_XPR_CSTR_(Char, st) boost::xpressive::detail::string_literal<Char>::pick(st, L##st) | |
#else | |
# define BOOST_XPR_CHAR_(Char, ch) boost::xpressive::detail::char_literal<Char, ch, L##ch>::value | |
# define BOOST_XPR_CSTR_(Char, st) boost::xpressive::detail::string_literal<Char>::pick(st, L##st) | |
#endif | |
}}} // namespace boost::xpressive::detail | |
#endif |