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Editing: make_signed.hpp
// (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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