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) && !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