/src/boost/boost/xpressive/detail/utility/literals.hpp
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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 | 0 | { |
48 | 0 | return cstr; |
49 | 0 | } |
50 | | |
51 | | static BOOST_CONSTEXPR char pick(char ch, wchar_t) |
52 | 0 | { |
53 | 0 | return ch; |
54 | 0 | } |
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 | 0 | { |
62 | 0 | return cstr; |
63 | 0 | } |
64 | | |
65 | | static BOOST_CONSTEXPR wchar_t pick(char, wchar_t ch) |
66 | 0 | { |
67 | 0 | return ch; |
68 | 0 | } |
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 |