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2 | // (C) Copyright John Maddock 2007. | |
3 | // Use, modification and distribution are subject to the Boost Software License, | |
4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt). | |
6 | // | |
7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. | |
8 | ||
9 | #ifndef BOOST_TT_MAKE_SIGNED_HPP_INCLUDED | |
10 | #define BOOST_TT_MAKE_SIGNED_HPP_INCLUDED | |
11 | ||
12 | #include <boost/type_traits/conditional.hpp> | |
13 | #include <boost/type_traits/is_integral.hpp> | |
14 | #include <boost/type_traits/is_signed.hpp> | |
15 | #include <boost/type_traits/is_unsigned.hpp> | |
16 | #include <boost/type_traits/is_enum.hpp> | |
17 | #include <boost/type_traits/is_same.hpp> | |
18 | #include <boost/type_traits/remove_cv.hpp> | |
19 | #include <boost/type_traits/is_const.hpp> | |
20 | #include <boost/type_traits/is_volatile.hpp> | |
21 | #include <boost/type_traits/add_const.hpp> | |
22 | #include <boost/type_traits/add_volatile.hpp> | |
23 | #include <boost/static_assert.hpp> | |
24 | ||
25 | namespace boost { | |
26 | ||
27 | template <class T> | |
28 | struct make_signed | |
29 | { | |
30 | private: | |
31 | BOOST_STATIC_ASSERT_MSG(( ::boost::is_integral<T>::value || ::boost::is_enum<T>::value), "The template argument to make_signed must be an integer or enum type."); | |
32 | BOOST_STATIC_ASSERT_MSG(!(::boost::is_same<typename remove_cv<T>::type, bool>::value), "The template argument to make_signed must not be the type bool."); | |
33 | ||
34 | typedef typename remove_cv<T>::type t_no_cv; | |
35 | typedef typename conditional< | |
36 | (::boost::is_signed<T>::value | |
37 | && ::boost::is_integral<T>::value | |
38 | && ! ::boost::is_same<t_no_cv, char>::value | |
39 | && ! ::boost::is_same<t_no_cv, wchar_t>::value | |
40 | && ! ::boost::is_same<t_no_cv, bool>::value), | |
41 | T, | |
42 | typename conditional< | |
43 | (::boost::is_integral<T>::value | |
44 | && ! ::boost::is_same<t_no_cv, char>::value | |
45 | && ! ::boost::is_same<t_no_cv, wchar_t>::value | |
46 | && ! ::boost::is_same<t_no_cv, bool>::value), | |
47 | typename conditional< | |
48 | is_same<t_no_cv, unsigned char>::value, | |
49 | signed char, | |
50 | typename conditional< | |
51 | is_same<t_no_cv, unsigned short>::value, | |
52 | signed short, | |
53 | typename conditional< | |
54 | is_same<t_no_cv, unsigned int>::value, | |
55 | int, | |
56 | typename conditional< | |
57 | is_same<t_no_cv, unsigned long>::value, | |
58 | long, | |
59 | #if defined(BOOST_HAS_LONG_LONG) | |
60 | #ifdef BOOST_HAS_INT128 | |
61 | typename conditional< | |
62 | sizeof(t_no_cv) == sizeof(boost::long_long_type), | |
63 | boost::long_long_type, | |
64 | boost::int128_type | |
65 | >::type | |
66 | #else | |
67 | boost::long_long_type | |
68 | #endif | |
69 | #elif defined(BOOST_HAS_MS_INT64) | |
70 | __int64 | |
71 | #else | |
72 | long | |
73 | #endif | |
74 | >::type | |
75 | >::type | |
76 | >::type | |
77 | >::type, | |
78 | // Not a regular integer type: | |
79 | typename conditional< | |
80 | sizeof(t_no_cv) == sizeof(unsigned char), | |
81 | signed char, | |
82 | typename conditional< | |
83 | sizeof(t_no_cv) == sizeof(unsigned short), | |
84 | signed short, | |
85 | typename conditional< | |
86 | sizeof(t_no_cv) == sizeof(unsigned int), | |
87 | int, | |
88 | typename conditional< | |
89 | sizeof(t_no_cv) == sizeof(unsigned long), | |
90 | long, | |
91 | #if defined(BOOST_HAS_LONG_LONG) | |
92 | #ifdef BOOST_HAS_INT128 | |
93 | typename conditional< | |
94 | sizeof(t_no_cv) == sizeof(boost::long_long_type), | |
95 | boost::long_long_type, | |
96 | boost::int128_type | |
97 | >::type | |
98 | #else | |
99 | boost::long_long_type | |
100 | #endif | |
101 | #elif defined(BOOST_HAS_MS_INT64) | |
102 | __int64 | |
103 | #else | |
104 | long | |
105 | #endif | |
106 | >::type | |
107 | >::type | |
108 | >::type | |
109 | >::type | |
110 | >::type | |
111 | >::type base_integer_type; | |
112 | ||
113 | // Add back any const qualifier: | |
114 | typedef typename conditional< | |
115 | is_const<T>::value, | |
116 | typename add_const<base_integer_type>::type, | |
117 | base_integer_type | |
118 | >::type const_base_integer_type; | |
119 | public: | |
120 | // Add back any volatile qualifier: | |
121 | typedef typename conditional< | |
122 | is_volatile<T>::value, | |
123 | typename add_volatile<const_base_integer_type>::type, | |
124 | const_base_integer_type | |
125 | >::type type; | |
126 | }; | |
127 | ||
128 | } // namespace boost | |
129 | ||
130 | #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED | |
131 |