boost/type_traits/make_unsigned.hpp

   1
   2 //  (C) Copyright John Maddock 2007.
   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 #ifndef BOOST_TT_MAKE_UNSIGNED_HPP_INCLUDED
  10 #define BOOST_TT_MAKE_UNSIGNED_HPP_INCLUDED
  11
  12 #include <boost/mpl/if.hpp>
  13 #include <boost/type_traits/is_integral.hpp>
  14 #include <boost/type_traits/is_signed.hpp>
  15 #include <boost/type_traits/is_unsigned.hpp>
  16 #include <boost/type_traits/is_enum.hpp>
  17 #include <boost/type_traits/is_same.hpp>
  18 #include <boost/type_traits/remove_cv.hpp>
  19 #include <boost/type_traits/is_const.hpp>
  20 #include <boost/type_traits/is_volatile.hpp>
  21 #include <boost/type_traits/add_const.hpp>
  22 #include <boost/type_traits/add_volatile.hpp>
  23 #include <boost/type_traits/detail/ice_or.hpp>
  24 #include <boost/type_traits/detail/ice_and.hpp>
  25 #include <boost/type_traits/detail/ice_not.hpp>
  26 #include <boost/static_assert.hpp>
  27
  28 // should be the last #include
  29 #include <boost/type_traits/detail/type_trait_def.hpp>
  30
  31 namespace boost {
  32
  33 namespace detail {
  34
  35 template <class T>
  36 struct make_unsigned_imp
  37 {
  38    BOOST_STATIC_ASSERT(
  39       (::boost::type_traits::ice_or< ::boost::is_integral<T>::value, ::boost::is_enum<T>::value>::value));
  40 #if !BOOST_WORKAROUND(BOOST_MSVC, <=1300)
  41    BOOST_STATIC_ASSERT(
  42       (::boost::type_traits::ice_not< ::boost::is_same<
  43          typename remove_cv<T>::type, bool>::value>::value));
  44 #endif
  45
  46    typedef typename remove_cv<T>::type t_no_cv;
  47    typedef typename mpl::if_c<
  48       (::boost::type_traits::ice_and<
  49          ::boost::is_unsigned<T>::value,
  50          ::boost::is_integral<T>::value,
  51          ::boost::type_traits::ice_not< ::boost::is_same<t_no_cv, char>::value>::value,
  52          ::boost::type_traits::ice_not< ::boost::is_same<t_no_cv, wchar_t>::value>::value,
  53          ::boost::type_traits::ice_not< ::boost::is_same<t_no_cv, bool>::value>::value >::value),
  54       T,
  55       typename mpl::if_c<
  56          (::boost::type_traits::ice_and<
  57             ::boost::is_integral<T>::value,
  58             ::boost::type_traits::ice_not< ::boost::is_same<t_no_cv, char>::value>::value,
  59             ::boost::type_traits::ice_not< ::boost::is_same<t_no_cv, wchar_t>::value>::value,
  60             ::boost::type_traits::ice_not< ::boost::is_same<t_no_cv, bool>::value>::value>
  61          ::value),
  62          typename mpl::if_<
  63             is_same<t_no_cv, signed char>,
  64             unsigned char,
  65             typename mpl::if_<
  66                is_same<t_no_cv, short>,
  67                unsigned short,
  68                typename mpl::if_<
  69                   is_same<t_no_cv, int>,
  70                   unsigned int,
  71                   typename mpl::if_<
  72                      is_same<t_no_cv, long>,
  73                      unsigned long,
  74 #if defined(BOOST_HAS_LONG_LONG)
  75                      boost::ulong_long_type
  76 #elif defined(BOOST_HAS_MS_INT64)
  77                      unsigned __int64
  78 #else
  79                      unsigned long
  80 #endif
  81                   >::type
  82                >::type
  83             >::type
  84          >::type,
  85          // Not a regular integer type:
  86          typename mpl::if_c<
  87             sizeof(t_no_cv) == sizeof(unsigned char),
  88             unsigned char,
  89             typename mpl::if_c<
  90                sizeof(t_no_cv) == sizeof(unsigned short),
  91                unsigned short,
  92                typename mpl::if_c<
  93                   sizeof(t_no_cv) == sizeof(unsigned int),
  94                   unsigned int,
  95                   typename mpl::if_c<
  96                      sizeof(t_no_cv) == sizeof(unsigned long),
  97                      unsigned long,
  98 #if defined(BOOST_HAS_LONG_LONG)
  99                      boost::ulong_long_type
 100 #elif defined(BOOST_HAS_MS_INT64)
 101                      unsigned __int64
 102 #else
 103                      unsigned long
 104 #endif
 105                   >::type
 106                >::type
 107             >::type
 108          >::type
 109       >::type
 110    >::type base_integer_type;
 111
 112    // Add back any const qualifier:
 113    typedef typename mpl::if_<
 114       is_const<T>,
 115       typename add_const<base_integer_type>::type,
 116       base_integer_type
 117    >::type const_base_integer_type;
 118
 119    // Add back any volatile qualifier:
 120    typedef typename mpl::if_<
 121       is_volatile<T>,
 122       typename add_volatile<const_base_integer_type>::type,
 123       const_base_integer_type
 124    >::type type;
 125 };
 126
 127
 128 } // namespace detail
 129
 130 BOOST_TT_AUX_TYPE_TRAIT_DEF1(make_unsigned,T,typename boost::detail::make_unsigned_imp<T>::type)
 131
 132 } // namespace boost
 133
 134 #include <boost/type_traits/detail/type_trait_undef.hpp>
 135
 136 #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
 137