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