boost/type_traits/is_unsigned.hpp

   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)
  28
  29 template <class T>
  30 struct is_unsigned_values
  31 {
  32    typedef typename remove_cv<T>::type no_cv_t;
  33    BOOST_STATIC_CONSTANT(no_cv_t, minus_one = (static_cast<no_cv_t>(-1)));
  34    BOOST_STATIC_CONSTANT(no_cv_t, zero = (static_cast<no_cv_t>(0)));
  35 };
  36
  37 template <class T>
  38 struct is_ununsigned_helper
  39 {
  40    BOOST_STATIC_CONSTANT(bool, value = (::boost::detail::is_unsigned_values<T>::minus_one > ::boost::detail::is_unsigned_values<T>::zero));
  41 };
  42
  43 template <bool integral_type>
  44 struct is_ununsigned_select_helper
  45 {
  46    template <class T>
  47    struct rebind
  48    {
  49       typedef is_ununsigned_helper<T> type;
  50    };
  51 };
  52
  53 template <>
  54 struct is_ununsigned_select_helper<false>
  55 {
  56    template <class T>
  57    struct rebind
  58    {
  59       typedef false_type type;
  60    };
  61 };
  62
  63 template <class T>
  64 struct is_unsigned_imp
  65 {
  66    typedef is_ununsigned_select_helper<
  67       ::boost::type_traits::ice_or<
  68          ::boost::is_integral<T>::value,
  69          ::boost::is_enum<T>::value>::value
  70    > selector;
  71    typedef typename selector::template rebind<T> binder;
  72    typedef typename binder::type type;
  73    BOOST_STATIC_CONSTANT(bool, value = type::value);
  74 };
  75
  76 #else
  77
  78 template <class T> struct is_unsigned_imp : public false_type{};
  79 template <> struct is_unsigned_imp<unsigned char> : public true_type{};
  80 template <> struct is_unsigned_imp<const unsigned char> : public true_type{};
  81 template <> struct is_unsigned_imp<volatile unsigned char> : public true_type{};
  82 template <> struct is_unsigned_imp<const volatile unsigned char> : public true_type{};
  83 template <> struct is_unsigned_imp<unsigned short> : public true_type{};
  84 template <> struct is_unsigned_imp<const unsigned short> : public true_type{};
  85 template <> struct is_unsigned_imp<volatile unsigned short> : public true_type{};
  86 template <> struct is_unsigned_imp<const volatile unsigned short> : public true_type{};
  87 template <> struct is_unsigned_imp<unsigned int> : public true_type{};
  88 template <> struct is_unsigned_imp<const unsigned int> : public true_type{};
  89 template <> struct is_unsigned_imp<volatile unsigned int> : public true_type{};
  90 template <> struct is_unsigned_imp<const volatile unsigned int> : public true_type{};
  91 template <> struct is_unsigned_imp<unsigned long> : public true_type{};
  92 template <> struct is_unsigned_imp<const unsigned long> : public true_type{};
  93 template <> struct is_unsigned_imp<volatile unsigned long> : public true_type{};
  94 template <> struct is_unsigned_imp<const volatile unsigned long> : public true_type{};
  95 #ifdef BOOST_HAS_LONG_LONG
  96 template <> struct is_unsigned_imp<unsigned long long> : public true_type{};
  97 template <> struct is_unsigned_imp<const unsigned long long> : public true_type{};
  98 template <> struct is_unsigned_imp<volatile unsigned long long> : public true_type{};
  99 template <> struct is_unsigned_imp<const volatile unsigned long long> : public true_type{};
 100 #endif
 101 #if defined(CHAR_MIN) && (CHAR_MIN == 0)
 102 template <> struct is_unsigned_imp<char> : public true_type{};
 103 template <> struct is_unsigned_imp<const char> : public true_type{};
 104 template <> struct is_unsigned_imp<volatile char> : public true_type{};
 105 template <> struct is_unsigned_imp<const volatile char> : public true_type{};
 106 #endif
 107 #if defined(WCHAR_MIN) && (WCHAR_MIN == 0)
 108 template <> struct is_unsigned_imp<wchar_t> : public true_type{};
 109 template <> struct is_unsigned_imp<const wchar_t> : public true_type{};
 110 template <> struct is_unsigned_imp<volatile wchar_t> : public true_type{};
 111 template <> struct is_unsigned_imp<const volatile wchar_t> : public true_type{};
 112 #endif
 113
 114 #endif
 115
 116 }
 117
 118 #endif // !defined( __CODEGEARC__ )
 119
 120 #if defined( __CODEGEARC__ )
 121 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_unsigned,T,__is_unsigned(T))
 122 #else
 123 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_unsigned,T,::boost::detail::is_unsigned_imp<T>::value)
 124 #endif
 125
 126 } // namespace boost
 127
 128 #include <boost/type_traits/detail/bool_trait_undef.hpp>
 129
 130 #endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED