boost/type_traits/make_signed.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_SIGNED_HPP_INCLUDED
  10 #define BOOST_TT_MAKE_SIGNED_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_signed_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_signed<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, unsigned char>,
  64             signed char,
  65             typename mpl::if_<
  66                is_same<t_no_cv, unsigned short>,
  67                signed short,
  68                typename mpl::if_<
  69                   is_same<t_no_cv, unsigned int>,
  70                   int,
  71                   typename mpl::if_<
  72                      is_same<t_no_cv, unsigned long>,
  73                      long,
  74 #if defined(BOOST_HAS_LONG_LONG)
  75 #ifdef BOOST_HAS_INT128
  76                      typename mpl::if_c<
  77                         sizeof(t_no_cv) == sizeof(boost::long_long_type),
  78                         boost::long_long_type,
  79                         boost::int128_type
  80                      >::type
  81 #else
  82                      boost::long_long_type
  83 #endif
  84 #elif defined(BOOST_HAS_MS_INT64)
  85                      __int64
  86 #else
  87                      long
  88 #endif
  89                   >::type
  90                >::type
  91             >::type
  92          >::type,
  93          // Not a regular integer type:
  94          typename mpl::if_c<
  95             sizeof(t_no_cv) == sizeof(unsigned char),
  96             signed char,
  97             typename mpl::if_c<
  98                sizeof(t_no_cv) == sizeof(unsigned short),
  99                signed short,
 100                typename mpl::if_c<
 101                   sizeof(t_no_cv) == sizeof(unsigned int),
 102                   int,
 103                   typename mpl::if_c<
 104                      sizeof(t_no_cv) == sizeof(unsigned long),
 105                      long,
 106 #if defined(BOOST_HAS_LONG_LONG)
 107 #ifdef BOOST_HAS_INT128
 108                      typename mpl::if_c<
 109                         sizeof(t_no_cv) == sizeof(boost::long_long_type),
 110                         boost::long_long_type,
 111                         boost::int128_type
 112                      >::type
 113 #else
 114                      boost::long_long_type
 115 #endif
 116 #elif defined(BOOST_HAS_MS_INT64)
 117                      __int64
 118 #else
 119                      long
 120 #endif
 121                   >::type
 122                >::type
 123             >::type
 124          >::type
 125       >::type
 126    >::type base_integer_type;
 127
 128    // Add back any const qualifier:
 129    typedef typename mpl::if_<
 130       is_const<T>,
 131       typename add_const<base_integer_type>::type,
 132       base_integer_type
 133    >::type const_base_integer_type;
 134
 135    // Add back any volatile qualifier:
 136    typedef typename mpl::if_<
 137       is_volatile<T>,
 138       typename add_volatile<const_base_integer_type>::type,
 139       const_base_integer_type
 140    >::type type;
 141 };
 142
 143
 144 } // namespace detail
 145
 146 BOOST_TT_AUX_TYPE_TRAIT_DEF1(make_signed,T,typename boost::detail::make_signed_imp<T>::type)
 147
 148 } // namespace boost
 149
 150 #include <boost/type_traits/detail/type_trait_undef.hpp>
 151
 152 #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
 153