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- // (C) Copyright John Maddock 2007.
- // Use, modification and distribution are subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt).
- //
- // See http://www.boost.org/libs/type_traits for most recent version including documentation.
- #ifndef BOOST_TT_MAKE_SIGNED_HPP_INCLUDED
- #define BOOST_TT_MAKE_SIGNED_HPP_INCLUDED
- #include <boost/type_traits/conditional.hpp>
- #include <boost/type_traits/is_integral.hpp>
- #include <boost/type_traits/is_signed.hpp>
- #include <boost/type_traits/is_unsigned.hpp>
- #include <boost/type_traits/is_enum.hpp>
- #include <boost/type_traits/is_same.hpp>
- #include <boost/type_traits/remove_cv.hpp>
- #include <boost/type_traits/is_const.hpp>
- #include <boost/type_traits/is_volatile.hpp>
- #include <boost/type_traits/add_const.hpp>
- #include <boost/type_traits/add_volatile.hpp>
- #include <boost/static_assert.hpp>
- namespace boost {
- template <class T>
- struct make_signed
- {
- private:
- BOOST_STATIC_ASSERT_MSG(( ::boost::is_integral<T>::value || ::boost::is_enum<T>::value), "The template argument to make_signed must be an integer or enum type.");
- BOOST_STATIC_ASSERT_MSG(!(::boost::is_same<typename remove_cv<T>::type, bool>::value), "The template argument to make_signed must not be the type bool.");
- typedef typename remove_cv<T>::type t_no_cv;
- typedef typename conditional<
- (::boost::is_signed<T>::value
- && ::boost::is_integral<T>::value
- && ! ::boost::is_same<t_no_cv, char>::value
- && ! ::boost::is_same<t_no_cv, wchar_t>::value
- && ! ::boost::is_same<t_no_cv, bool>::value),
- T,
- typename conditional<
- (::boost::is_integral<T>::value
- && ! ::boost::is_same<t_no_cv, char>::value
- && ! ::boost::is_same<t_no_cv, wchar_t>::value
- && ! ::boost::is_same<t_no_cv, bool>::value),
- typename conditional<
- is_same<t_no_cv, unsigned char>::value,
- signed char,
- typename conditional<
- is_same<t_no_cv, unsigned short>::value,
- signed short,
- typename conditional<
- is_same<t_no_cv, unsigned int>::value,
- int,
- typename conditional<
- is_same<t_no_cv, unsigned long>::value,
- long,
- #if defined(BOOST_HAS_LONG_LONG)
- #ifdef BOOST_HAS_INT128
- typename conditional<
- sizeof(t_no_cv) == sizeof(boost::long_long_type),
- boost::long_long_type,
- boost::int128_type
- >::type
- #else
- boost::long_long_type
- #endif
- #elif defined(BOOST_HAS_MS_INT64)
- __int64
- #else
- long
- #endif
- >::type
- >::type
- >::type
- >::type,
- // Not a regular integer type:
- typename conditional<
- sizeof(t_no_cv) == sizeof(unsigned char),
- signed char,
- typename conditional<
- sizeof(t_no_cv) == sizeof(unsigned short),
- signed short,
- typename conditional<
- sizeof(t_no_cv) == sizeof(unsigned int),
- int,
- typename conditional<
- sizeof(t_no_cv) == sizeof(unsigned long),
- long,
- #if defined(BOOST_HAS_LONG_LONG)
- #ifdef BOOST_HAS_INT128
- typename conditional<
- sizeof(t_no_cv) == sizeof(boost::long_long_type),
- boost::long_long_type,
- boost::int128_type
- >::type
- #else
- boost::long_long_type
- #endif
- #elif defined(BOOST_HAS_MS_INT64)
- __int64
- #else
- long
- #endif
- >::type
- >::type
- >::type
- >::type
- >::type
- >::type base_integer_type;
-
- // Add back any const qualifier:
- typedef typename conditional<
- is_const<T>::value,
- typename add_const<base_integer_type>::type,
- base_integer_type
- >::type const_base_integer_type;
- public:
- // Add back any volatile qualifier:
- typedef typename conditional<
- is_volatile<T>::value,
- typename add_volatile<const_base_integer_type>::type,
- const_base_integer_type
- >::type type;
- };
- #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
- template <class T> using make_signed_t = typename make_signed<T>::type;
- #endif
- } // namespace boost
- #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
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