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_UNSIGNED_HPP_INCLUDED 11 #define BOOST_TT_IS_UNSIGNED_HPP_INCLUDED 12 13 #include <boost/type_traits/is_integral.hpp> 14 #include <boost/type_traits/is_enum.hpp> 15 #include <boost/type_traits/remove_cv.hpp> 16 #include <boost/type_traits/detail/ice_or.hpp> 17 18 // should be the last #include 19 #include <boost/type_traits/detail/bool_trait_def.hpp> 20 21 namespace boost { 22 23 #if !defined( __CODEGEARC__ ) 24 25 namespace detail{ 26 27 #if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238) && !defined(BOOST_NO_INCLASS_MEMBER_INITIALIZATION) 28 29 template <class T> 30 struct is_unsigned_values 31 { 32 // 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. 36 // 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)); 40 }; 41 42 template <class T> 43 struct is_ununsigned_helper 44 { 45 BOOST_STATIC_CONSTANT(bool, value = (::boost::detail::is_unsigned_values<T>::minus_one > ::boost::detail::is_unsigned_values<T>::zero)); 46 }; 47 48 template <bool integral_type> 49 struct is_ununsigned_select_helper 50 { 51 template <class T> 52 struct rebind 53 { 54 typedef is_ununsigned_helper<T> type; 55 }; 56 }; 57 58 template <> 59 struct is_ununsigned_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_unsigned_imp 70 { 71 typedef is_ununsigned_select_helper< 72 ::boost::type_traits::ice_or< 73 ::boost::is_integral<T>::value, 74 ::boost::is_enum<T>::value>::value 75 > selector; 76 typedef typename selector::template rebind<T> binder; 77 typedef typename binder::type type; 78 BOOST_STATIC_CONSTANT(bool, value = type::value); 79 }; 80 81 #else 82 83 template <class T> struct is_unsigned_imp : public false_type{}; 84 template <> struct is_unsigned_imp<unsigned char> : public true_type{}; 85 template <> struct is_unsigned_imp<const unsigned char> : public true_type{}; 86 template <> struct is_unsigned_imp<volatile unsigned char> : public true_type{}; 87 template <> struct is_unsigned_imp<const volatile unsigned char> : public true_type{}; 88 template <> struct is_unsigned_imp<unsigned short> : public true_type{}; 89 template <> struct is_unsigned_imp<const unsigned short> : public true_type{}; 90 template <> struct is_unsigned_imp<volatile unsigned short> : public true_type{}; 91 template <> struct is_unsigned_imp<const volatile unsigned short> : public true_type{}; 92 template <> struct is_unsigned_imp<unsigned int> : public true_type{}; 93 template <> struct is_unsigned_imp<const unsigned int> : public true_type{}; 94 template <> struct is_unsigned_imp<volatile unsigned int> : public true_type{}; 95 template <> struct is_unsigned_imp<const volatile unsigned int> : public true_type{}; 96 template <> struct is_unsigned_imp<unsigned long> : public true_type{}; 97 template <> struct is_unsigned_imp<const unsigned long> : public true_type{}; 98 template <> struct is_unsigned_imp<volatile unsigned long> : public true_type{}; 99 template <> struct is_unsigned_imp<const volatile unsigned long> : public true_type{}; 100 #ifdef BOOST_HAS_LONG_LONG 101 template <> struct is_unsigned_imp<unsigned long long> : public true_type{}; 102 template <> struct is_unsigned_imp<const unsigned long long> : public true_type{}; 103 template <> struct is_unsigned_imp<volatile unsigned long long> : public true_type{}; 104 template <> struct is_unsigned_imp<const volatile unsigned long long> : public true_type{}; 105 #endif 106 #if defined(CHAR_MIN) && (CHAR_MIN == 0) 107 template <> struct is_unsigned_imp<char> : public true_type{}; 108 template <> struct is_unsigned_imp<const char> : public true_type{}; 109 template <> struct is_unsigned_imp<volatile char> : public true_type{}; 110 template <> struct is_unsigned_imp<const volatile char> : public true_type{}; 111 #endif 112 #if defined(WCHAR_MIN) && (WCHAR_MIN == 0) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) 113 template <> struct is_unsigned_imp<wchar_t> : public true_type{}; 114 template <> struct is_unsigned_imp<const wchar_t> : public true_type{}; 115 template <> struct is_unsigned_imp<volatile wchar_t> : public true_type{}; 116 template <> struct is_unsigned_imp<const volatile wchar_t> : public true_type{}; 117 #endif 118 119 #endif 120 121 } 122 123 #endif // !defined( __CODEGEARC__ ) 124 125 #if defined( __CODEGEARC__ ) 126 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_unsigned,T,__is_unsigned(T)) 127 #else 128 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_unsigned,T,::boost::detail::is_unsigned_imp<T>::value) 129 #endif 130 131 } // namespace boost 132 133 #include <boost/type_traits/detail/bool_trait_undef.hpp> 134 135 #endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED 136