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 namespace detail{
  24
  25 #if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238)
  26
  27 template <class T>
  28 struct is_ununsigned_helper
  29 {
  30    typedef typename remove_cv<T>::type no_cv_t;
  31    BOOST_STATIC_CONSTANT(bool, value = (static_cast<no_cv_t>(-1) > 0));
  32 };
  33
  34 template <bool integral_type>
  35 struct is_ununsigned_select_helper
  36 {
  37    template <class T>
  38    struct rebind
  39    {
  40       typedef is_ununsigned_helper<T> type;
  41    };
  42 };
  43
  44 template <>
  45 struct is_ununsigned_select_helper<false>
  46 {
  47    template <class T>
  48    struct rebind
  49    {
  50       typedef false_type type;
  51    };
  52 };
  53
  54 template <class T>
  55 struct is_unsigned_imp
  56 {
  57    typedef is_ununsigned_select_helper<
  58       ::boost::type_traits::ice_or<
  59          ::boost::is_integral<T>::value,
  60          ::boost::is_enum<T>::value>::value
  61    > selector;
  62    typedef typename selector::template rebind<T> binder;
  63    typedef typename binder::type type;
  64    BOOST_STATIC_CONSTANT(bool, value = type::value);
  65 };
  66
  67 #else
  68
  69 template <class T> struct is_unsigned_imp : public false_type{};
  70 template <> struct is_unsigned_imp<unsigned char> : public true_type{};
  71 template <> struct is_unsigned_imp<const unsigned char> : public true_type{};
  72 template <> struct is_unsigned_imp<volatile unsigned char> : public true_type{};
  73 template <> struct is_unsigned_imp<const volatile unsigned char> : public true_type{};
  74 template <> struct is_unsigned_imp<unsigned short> : public true_type{};
  75 template <> struct is_unsigned_imp<const unsigned short> : public true_type{};
  76 template <> struct is_unsigned_imp<volatile unsigned short> : public true_type{};
  77 template <> struct is_unsigned_imp<const volatile unsigned short> : public true_type{};
  78 template <> struct is_unsigned_imp<unsigned int> : public true_type{};
  79 template <> struct is_unsigned_imp<const unsigned int> : public true_type{};
  80 template <> struct is_unsigned_imp<volatile unsigned int> : public true_type{};
  81 template <> struct is_unsigned_imp<const volatile unsigned int> : public true_type{};
  82 template <> struct is_unsigned_imp<unsigned long> : public true_type{};
  83 template <> struct is_unsigned_imp<const unsigned long> : public true_type{};
  84 template <> struct is_unsigned_imp<volatile unsigned long> : public true_type{};
  85 template <> struct is_unsigned_imp<const volatile unsigned long> : public true_type{};
  86 #ifdef BOOST_HAS_LONG_LONG
  87 template <> struct is_unsigned_imp<unsigned long long> : public true_type{};
  88 template <> struct is_unsigned_imp<const unsigned long long> : public true_type{};
  89 template <> struct is_unsigned_imp<volatile unsigned long long> : public true_type{};
  90 template <> struct is_unsigned_imp<const volatile unsigned long long> : public true_type{};
  91 #endif
  92 #if defined(CHAR_MIN) && (CHAR_MIN == 0)
  93 template <> struct is_unsigned_imp<char> : public true_type{};
  94 template <> struct is_unsigned_imp<const char> : public true_type{};
  95 template <> struct is_unsigned_imp<volatile char> : public true_type{};
  96 template <> struct is_unsigned_imp<const volatile char> : public true_type{};
  97 #endif
  98 #if defined(WCHAR_MIN) && (WCHAR_MIN == 0)
  99 template <> struct is_unsigned_imp<wchar_t> : public true_type{};
 100 template <> struct is_unsigned_imp<const wchar_t> : public true_type{};
 101 template <> struct is_unsigned_imp<volatile wchar_t> : public true_type{};
 102 template <> struct is_unsigned_imp<const volatile wchar_t> : public true_type{};
 103 #endif
 104
 105 #endif
 106
 107
 108 }
 109
 110 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_unsigned,T,::boost::detail::is_unsigned_imp<T>::value)
 111
 112 } // namespace boost
 113
 114 #include <boost/type_traits/detail/bool_trait_undef.hpp>
 115
 116 #endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED