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