92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
// Copyright 2005 Alexander Nasonov.
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#ifndef FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED
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#define FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED
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#include <boost/config.hpp>
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#ifdef BOOST_NO_CV_SPECIALIZATIONS
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/multiplies.hpp>
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#include <boost/mpl/plus.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/type_traits/is_same.hpp>
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#endif
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// Should be the last #include
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#include <boost/type_traits/detail/type_trait_def.hpp>
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namespace boost {
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namespace type_traits { namespace detail {
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#ifndef BOOST_NO_CV_SPECIALIZATIONS
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template<class T>
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struct floating_point_promotion
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{
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typedef T type;
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};
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template<>
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struct floating_point_promotion<float>
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{
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typedef double type;
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};
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template<>
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struct floating_point_promotion<float const>
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{
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typedef double const type;
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};
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template<>
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struct floating_point_promotion<float volatile>
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{
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typedef double volatile type;
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};
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template<>
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struct floating_point_promotion<float const volatile>
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{
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typedef double const volatile type;
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};
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#else
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template<class T>
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struct floating_point_promotion
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: mpl::at<
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mpl::vector< T, double, double const, double volatile,
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double const volatile >
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, mpl::plus<
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is_same<T, float>
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, mpl::multiplies< is_same<T, float const> , mpl::int_<2> >
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, mpl::multiplies< is_same<T, float volatile> , mpl::int_<3> >
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, mpl::multiplies< is_same<T, float const volatile>, mpl::int_<4> >
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>
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>
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{
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};
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#endif
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} }
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BOOST_TT_AUX_TYPE_TRAIT_DEF1(
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floating_point_promotion
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, T
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, BOOST_DEDUCED_TYPENAME
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boost::type_traits::detail::floating_point_promotion<T>::type
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)
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}
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#include <boost/type_traits/detail/type_trait_undef.hpp>
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#endif // #ifndef FILE_boost_type_traits_floating_point_promotion_hpp_INCLUDED
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