84 lines
2.0 KiB
Plaintext
84 lines
2.0 KiB
Plaintext
/* Copyright 2003-2014 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (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/multi_index for library home page.
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*/
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#ifndef BOOST_MULTI_INDEX_DETAIL_PROMOTES_ARG_HPP
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#define BOOST_MULTI_INDEX_DETAIL_PROMOTES_ARG_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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#include <boost/mpl/bool.hpp>
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#include <boost/type_traits/intrinsics.hpp>
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/* Metafunctions to check if f(arg1,arg2) promotes either arg1 to the type of
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* arg2 or viceversa. By default, (i.e. if it cannot be determined), no
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* promotion is assumed.
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*/
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#if !defined(BOOST_IS_CONVERTIBLE)
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namespace boost{
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namespace multi_index{
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namespace detail{
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template<typename F,typename Arg1,typename Arg2>
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struct promotes_1st_arg:mpl::false_{};
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template<typename F,typename Arg1,typename Arg2>
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struct promotes_2nd_arg:mpl::false_{};
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} /* namespace multi_index::detail */
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} /* namespace multi_index */
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} /* namespace boost */
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#else
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/multi_index/detail/is_transparent.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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namespace boost{
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namespace multi_index{
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namespace detail{
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template<typename F,typename Arg1,typename Arg2>
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struct promotes_1st_arg:
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mpl::and_<
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mpl::not_<is_transparent<F,Arg1,Arg2> >,
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is_convertible<const Arg1,Arg2>,
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is_transparent<F,Arg2,Arg2>
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>
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{};
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template<typename F,typename Arg1,typename Arg2>
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struct promotes_2nd_arg:
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mpl::and_<
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mpl::not_<is_transparent<F,Arg1,Arg2> >,
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is_convertible<const Arg2,Arg1>,
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is_transparent<F,Arg1,Arg1>
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>
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{};
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} /* namespace multi_index::detail */
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} /* namespace multi_index */
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} /* namespace boost */
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#endif /* defined(BOOST_IS_CONVERTIBLE) */
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#endif
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