114 lines
2.9 KiB
Plaintext
114 lines
2.9 KiB
Plaintext
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#ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
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#define BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
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//
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// Copyright 2015 Peter Dimov
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//
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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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#include <boost/type_traits/detail/composite_pointer_type.hpp>
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#include <boost/type_traits/remove_pointer.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/type_traits/conditional.hpp>
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#include <boost/config.hpp>
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#include <cstddef>
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namespace boost
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{
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namespace type_traits_detail
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{
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template<class T, class U> struct composite_member_pointer_type;
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// nullptr_t
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#if !defined( BOOST_NO_CXX11_NULLPTR )
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#if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
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template<class C, class T> struct composite_member_pointer_type<T C::*, decltype(nullptr)>
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{
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typedef T C::* type;
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};
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template<class C, class T> struct composite_member_pointer_type<decltype(nullptr), T C::*>
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{
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typedef T C::* type;
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};
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template<> struct composite_member_pointer_type<decltype(nullptr), decltype(nullptr)>
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{
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typedef decltype(nullptr) type;
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};
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#else
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template<class C, class T> struct composite_member_pointer_type<T C::*, std::nullptr_t>
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{
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typedef T C::* type;
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};
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template<class C, class T> struct composite_member_pointer_type<std::nullptr_t, T C::*>
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{
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typedef T C::* type;
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};
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template<> struct composite_member_pointer_type<std::nullptr_t, std::nullptr_t>
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{
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typedef std::nullptr_t type;
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};
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#endif
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#endif // !defined( BOOST_NO_CXX11_NULLPTR )
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template<class C1, class C2> struct common_member_class;
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template<class C> struct common_member_class<C, C>
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{
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typedef C type;
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};
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template<class C1, class C2> struct common_member_class
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{
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typedef typename boost::conditional<
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boost::is_base_of<C1, C2>::value,
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C2,
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typename boost::conditional<boost::is_base_of<C2, C1>::value, C1, void>::type
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>::type type;
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};
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//This indirection avoids compilation errors on some older
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//compilers like MSVC 7.1
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template<class CT, class CB>
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struct common_member_class_pointer_to_member
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{
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typedef CT CB::* type;
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};
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template<class C1, class T1, class C2, class T2> struct composite_member_pointer_type<T1 C1::*, T2 C2::*>
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{
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private:
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typedef typename composite_pointer_type<T1*, T2*>::type CPT;
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typedef typename boost::remove_pointer<CPT>::type CT;
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typedef typename common_member_class<C1, C2>::type CB;
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public:
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typedef typename common_member_class_pointer_to_member<CT, CB>::type type;
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};
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} // namespace type_traits_detail
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} // namespace boost
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#endif // #ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
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