2 // (C) Copyright John Maddock 2005.
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).
7 // See http://www.boost.org/libs/type_traits for most recent version including documentation.
10 #ifndef BOOST_TT_IS_SIGNED_HPP_INCLUDED
11 #define BOOST_TT_IS_SIGNED_HPP_INCLUDED
13 #include <boost/type_traits/is_integral.hpp>
14 #include <boost/type_traits/remove_cv.hpp>
15 #include <boost/type_traits/is_enum.hpp>
16 #include <boost/type_traits/detail/ice_or.hpp>
18 // should be the last #include
19 #include <boost/type_traits/detail/bool_trait_def.hpp>
23 #if !defined( __CODEGEARC__ )
27 #if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238) && !defined(BOOST_NO_INCLASS_MEMBER_INITIALIZATION)
30 struct is_signed_values
33 // Note that we cannot use BOOST_STATIC_CONSTANT here, using enum's
34 // rather than "real" static constants simply doesn't work or give
35 // the correct answer.
37 typedef typename remove_cv<T>::type no_cv_t;
38 static const no_cv_t minus_one = (static_cast<no_cv_t>(-1));
39 static const no_cv_t zero = (static_cast<no_cv_t>(0));
43 struct is_signed_helper
45 typedef typename remove_cv<T>::type no_cv_t;
46 BOOST_STATIC_CONSTANT(bool, value = (!(::boost::detail::is_signed_values<T>::minus_one > boost::detail::is_signed_values<T>::zero)));
49 template <bool integral_type>
50 struct is_signed_select_helper
55 typedef is_signed_helper<T> type;
60 struct is_signed_select_helper<false>
65 typedef false_type type;
72 typedef is_signed_select_helper<
73 ::boost::type_traits::ice_or<
74 ::boost::is_integral<T>::value,
75 ::boost::is_enum<T>::value>::value
77 typedef typename selector::template rebind<T> binder;
78 typedef typename binder::type type;
79 #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
80 BOOST_STATIC_CONSTANT(bool, value = is_signed_imp<T>::type::value);
82 BOOST_STATIC_CONSTANT(bool, value = type::value);
88 template <class T> struct is_signed_imp : public false_type{};
89 template <> struct is_signed_imp<signed char> : public true_type{};
90 template <> struct is_signed_imp<const signed char> : public true_type{};
91 template <> struct is_signed_imp<volatile signed char> : public true_type{};
92 template <> struct is_signed_imp<const volatile signed char> : public true_type{};
93 template <> struct is_signed_imp<short> : public true_type{};
94 template <> struct is_signed_imp<const short> : public true_type{};
95 template <> struct is_signed_imp<volatile short> : public true_type{};
96 template <> struct is_signed_imp<const volatile short> : public true_type{};
97 template <> struct is_signed_imp<int> : public true_type{};
98 template <> struct is_signed_imp<const int> : public true_type{};
99 template <> struct is_signed_imp<volatile int> : public true_type{};
100 template <> struct is_signed_imp<const volatile int> : public true_type{};
101 template <> struct is_signed_imp<long> : public true_type{};
102 template <> struct is_signed_imp<const long> : public true_type{};
103 template <> struct is_signed_imp<volatile long> : public true_type{};
104 template <> struct is_signed_imp<const volatile long> : public true_type{};
105 #ifdef BOOST_HAS_LONG_LONG
106 template <> struct is_signed_imp<long long> : public true_type{};
107 template <> struct is_signed_imp<const long long> : public true_type{};
108 template <> struct is_signed_imp<volatile long long> : public true_type{};
109 template <> struct is_signed_imp<const volatile long long> : public true_type{};
111 #if defined(CHAR_MIN) && (CHAR_MIN != 0)
112 template <> struct is_signed_imp<char> : public true_type{};
113 template <> struct is_signed_imp<const char> : public true_type{};
114 template <> struct is_signed_imp<volatile char> : public true_type{};
115 template <> struct is_signed_imp<const volatile char> : public true_type{};
117 #if defined(WCHAR_MIN) && (WCHAR_MIN != 0)
118 template <> struct is_signed_imp<wchar_t> : public true_type{};
119 template <> struct is_signed_imp<const wchar_t> : public true_type{};
120 template <> struct is_signed_imp<volatile wchar_t> : public true_type{};
121 template <> struct is_signed_imp<const volatile wchar_t> : public true_type{};
128 #endif // !defined( __CODEGEARC__ )
130 #if defined( __CODEGEARC__ )
131 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_signed,T,__is_signed(T))
133 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_signed,T,::boost::detail::is_signed_imp<T>::value)
138 #include <boost/type_traits/detail/bool_trait_undef.hpp>
140 #endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED