136 lines
3.7 KiB
Plaintext
136 lines
3.7 KiB
Plaintext
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/* 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_IS_TRANSPARENT_HPP
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#define BOOST_MULTI_INDEX_DETAIL_IS_TRANSPARENT_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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namespace boost{
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namespace multi_index{
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namespace detail{
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/* Metafunction that checks if f(arg,arg2) executes without argument type
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* conversion. By default (i.e. when it cannot be determined) it evaluates to
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* true.
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*/
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template<typename F,typename Arg1,typename Arg2,typename=void>
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struct is_transparent:mpl::true_{};
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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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#if !defined(BOOST_NO_SFINAE)&&!defined(BOOST_NO_SFINAE_EXPR)&& \
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!defined(BOOST_NO_CXX11_DECLTYPE)&& \
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(defined(BOOST_NO_CXX11_FINAL)||defined(BOOST_IS_FINAL))
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/type_traits/function_traits.hpp>
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#include <boost/type_traits/is_class.hpp>
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#include <boost/type_traits/is_final.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/remove_pointer.hpp>
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#include <boost/utility/declval.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost{
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namespace multi_index{
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namespace detail{
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struct not_is_transparent_result_type{};
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template<typename F,typename Arg1,typename Arg2>
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struct is_transparent_class_helper:F
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{
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using F::operator();
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template<typename T,typename Q>
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not_is_transparent_result_type operator()(const T&,const Q&)const;
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};
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template<typename F,typename Arg1,typename Arg2,typename=void>
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struct is_transparent_class:mpl::true_{};
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template<typename F,typename Arg1,typename Arg2>
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struct is_transparent_class<
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F,Arg1,Arg2,
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typename enable_if<
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is_same<
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decltype(
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declval<const is_transparent_class_helper<F,Arg1,Arg2> >()(
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declval<const Arg1&>(),declval<const Arg2&>())
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),
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not_is_transparent_result_type
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>
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>::type
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>:mpl::false_{};
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template<typename F,typename Arg1,typename Arg2>
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struct is_transparent<
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F,Arg1,Arg2,
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typename enable_if<
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mpl::and_<
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is_class<F>,
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mpl::not_<is_final<F> > /* is_transparent_class_helper derives from F */
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>
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>::type
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>:is_transparent_class<F,Arg1,Arg2>{};
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template<typename F,typename Arg1,typename Arg2,typename=void>
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struct is_transparent_function:mpl::true_{};
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template<typename F,typename Arg1,typename Arg2>
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struct is_transparent_function<
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F,Arg1,Arg2,
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typename enable_if<
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mpl::or_<
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mpl::not_<mpl::or_<
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is_same<typename function_traits<F>::arg1_type,const Arg1&>,
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is_same<typename function_traits<F>::arg1_type,Arg1>
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> >,
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mpl::not_<mpl::or_<
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is_same<typename function_traits<F>::arg2_type,const Arg2&>,
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is_same<typename function_traits<F>::arg2_type,Arg2>
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> >
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>
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>::type
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>:mpl::false_{};
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template<typename F,typename Arg1,typename Arg2>
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struct is_transparent<
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F,Arg1,Arg2,
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typename enable_if<
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is_function<typename remove_pointer<F>::type>
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>::type
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>:is_transparent_function<typename remove_pointer<F>::type,Arg1,Arg2>{};
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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
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#endif
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