1 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). 6 // 7 // See http://www.boost.org/libs/type_traits for most recent version including documentation. 8 9 10 #ifndef BOOST_TT_IS_SIGNED_HPP_INCLUDED 11 #define BOOST_TT_IS_SIGNED_HPP_INCLUDED 12 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 <climits> 17 18 namespace boost { 19 20 #if !defined( __CODEGEARC__ ) 21 22 #if !(defined(BOOST_MSVC) && BOOST_MSVC <= 1310) && \ 23 !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238) &&\ 24 !defined(BOOST_NO_INCLASS_MEMBER_INITIALIZATION) 25 26 namespace detail{ 27 28 template <class T> 29 struct is_signed_values 30 { 31 // 32 // Note that we cannot use BOOST_STATIC_CONSTANT here, using enum's 33 // rather than "real" static constants simply doesn't work or give 34 // the correct answer. 35 // 36 typedef typename remove_cv<T>::type no_cv_t; 37 static const no_cv_t minus_one = (static_cast<no_cv_t>(-1)); 38 static const no_cv_t zero = (static_cast<no_cv_t>(0)); 39 }; 40 41 template <class T> 42 struct is_signed_helper 43 { 44 typedef typename remove_cv<T>::type no_cv_t; 45 BOOST_STATIC_CONSTANT(bool, value = (!(::boost::detail::is_signed_values<T>::minus_one > boost::detail::is_signed_values<T>::zero))); 46 }; 47 48 template <bool integral_type> 49 struct is_signed_select_helper 50 { 51 template <class T> 52 struct rebind 53 { 54 typedef is_signed_helper<T> type; 55 }; 56 }; 57 58 template <> 59 struct is_signed_select_helper<false> 60 { 61 template <class T> 62 struct rebind 63 { 64 typedef false_type type; 65 }; 66 }; 67 68 template <class T> 69 struct is_signed_impl 70 { 71 typedef ::boost::detail::is_signed_select_helper< ::boost::is_integral<T>::value || ::boost::is_enum<T>::value> selector; 72 typedef typename selector::template rebind<T> binder; 73 typedef typename binder::type type; 74 BOOST_STATIC_CONSTANT(bool, value = type::value); 75 }; 76 77 } 78 79 template <class T> struct is_signed : public integral_constant<bool, boost::detail::is_signed_impl<T>::value> {}; 80 81 #else 82 83 template <class T> struct is_signed : public false_type{}; 84 85 #endif 86 87 #else //defined( __CODEGEARC__ ) 88 template <class T> struct is_signed : public integral_constant<bool, __is_signed(T)>{}; 89 #endif 90 91 template <> struct is_signed<signed char> : public true_type{}; 92 template <> struct is_signed<const signed char> : public true_type{}; 93 template <> struct is_signed<volatile signed char> : public true_type{}; 94 template <> struct is_signed<const volatile signed char> : public true_type{}; 95 template <> struct is_signed<short> : public true_type{}; 96 template <> struct is_signed<const short> : public true_type{}; 97 template <> struct is_signed<volatile short> : public true_type{}; 98 template <> struct is_signed<const volatile short> : public true_type{}; 99 template <> struct is_signed<int> : public true_type{}; 100 template <> struct is_signed<const int> : public true_type{}; 101 template <> struct is_signed<volatile int> : public true_type{}; 102 template <> struct is_signed<const volatile int> : public true_type{}; 103 template <> struct is_signed<long> : public true_type{}; 104 template <> struct is_signed<const long> : public true_type{}; 105 template <> struct is_signed<volatile long> : public true_type{}; 106 template <> struct is_signed<const volatile long> : public true_type{}; 107 108 template <> struct is_signed<unsigned char> : public false_type{}; 109 template <> struct is_signed<const unsigned char> : public false_type{}; 110 template <> struct is_signed<volatile unsigned char> : public false_type{}; 111 template <> struct is_signed<const volatile unsigned char> : public false_type{}; 112 template <> struct is_signed<unsigned short> : public false_type{}; 113 template <> struct is_signed<const unsigned short> : public false_type{}; 114 template <> struct is_signed<volatile unsigned short> : public false_type{}; 115 template <> struct is_signed<const volatile unsigned short> : public false_type{}; 116 template <> struct is_signed<unsigned int> : public false_type{}; 117 template <> struct is_signed<const unsigned int> : public false_type{}; 118 template <> struct is_signed<volatile unsigned int> : public false_type{}; 119 template <> struct is_signed<const volatile unsigned int> : public false_type{}; 120 template <> struct is_signed<unsigned long> : public false_type{}; 121 template <> struct is_signed<const unsigned long> : public false_type{}; 122 template <> struct is_signed<volatile unsigned long> : public false_type{}; 123 template <> struct is_signed<const volatile unsigned long> : public false_type{}; 124 #ifdef BOOST_HAS_LONG_LONG 125 template <> struct is_signed< ::boost::long_long_type> : public true_type{}; 126 template <> struct is_signed<const ::boost::long_long_type> : public true_type{}; 127 template <> struct is_signed<volatile ::boost::long_long_type> : public true_type{}; 128 template <> struct is_signed<const volatile ::boost::long_long_type> : public true_type{}; 129 130 template <> struct is_signed< ::boost::ulong_long_type> : public false_type{}; 131 template <> struct is_signed<const ::boost::ulong_long_type> : public false_type{}; 132 template <> struct is_signed<volatile ::boost::ulong_long_type> : public false_type{}; 133 template <> struct is_signed<const volatile ::boost::ulong_long_type> : public false_type{}; 134 #endif 135 #if defined(CHAR_MIN) 136 #if CHAR_MIN != 0 137 template <> struct is_signed<char> : public true_type{}; 138 template <> struct is_signed<const char> : public true_type{}; 139 template <> struct is_signed<volatile char> : public true_type{}; 140 template <> struct is_signed<const volatile char> : public true_type{}; 141 #else 142 template <> struct is_signed<char> : public false_type{}; 143 template <> struct is_signed<const char> : public false_type{}; 144 template <> struct is_signed<volatile char> : public false_type{}; 145 template <> struct is_signed<const volatile char> : public false_type{}; 146 #endif 147 #endif 148 #if defined(WCHAR_MIN) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) 149 #if WCHAR_MIN != 0 150 template <> struct is_signed<wchar_t> : public true_type{}; 151 template <> struct is_signed<const wchar_t> : public true_type{}; 152 template <> struct is_signed<volatile wchar_t> : public true_type{}; 153 template <> struct is_signed<const volatile wchar_t> : public true_type{}; 154 #else 155 template <> struct is_signed<wchar_t> : public false_type{}; 156 template <> struct is_signed<const wchar_t> : public false_type{}; 157 template <> struct is_signed<volatile wchar_t> : public false_type{}; 158 template <> struct is_signed<const volatile wchar_t> : public false_type{}; 159 #endif 160 #endif 161 } // namespace boost 162 163 #endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED 164