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