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- #ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
- #define BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
- //
- // Copyright 2015 Peter Dimov
- //
- // Distributed under the Boost Software License, Version 1.0.
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- //
- #include <boost/type_traits/detail/composite_pointer_type.hpp>
- #include <boost/type_traits/remove_pointer.hpp>
- #include <boost/type_traits/is_base_of.hpp>
- #include <boost/type_traits/conditional.hpp>
- #include <boost/config.hpp>
- #include <cstddef>
- namespace boost
- {
- namespace type_traits_detail
- {
- template<class T, class U> struct composite_member_pointer_type;
- // nullptr_t
- #if !defined( BOOST_NO_CXX11_NULLPTR )
- #if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
- template<class C, class T> struct composite_member_pointer_type<T C::*, decltype(nullptr)>
- {
- typedef T C::* type;
- };
- template<class C, class T> struct composite_member_pointer_type<decltype(nullptr), T C::*>
- {
- typedef T C::* type;
- };
- template<> struct composite_member_pointer_type<decltype(nullptr), decltype(nullptr)>
- {
- typedef decltype(nullptr) type;
- };
- #else
- template<class C, class T> struct composite_member_pointer_type<T C::*, std::nullptr_t>
- {
- typedef T C::* type;
- };
- template<class C, class T> struct composite_member_pointer_type<std::nullptr_t, T C::*>
- {
- typedef T C::* type;
- };
- template<> struct composite_member_pointer_type<std::nullptr_t, std::nullptr_t>
- {
- typedef std::nullptr_t type;
- };
- #endif
- #endif // !defined( BOOST_NO_CXX11_NULLPTR )
- template<class C1, class C2> struct common_member_class;
- template<class C> struct common_member_class<C, C>
- {
- typedef C type;
- };
- template<class C1, class C2> struct common_member_class
- {
- typedef typename boost::conditional<
- boost::is_base_of<C1, C2>::value,
- C2,
- typename boost::conditional<boost::is_base_of<C2, C1>::value, C1, void>::type
- >::type type;
- };
- //This indirection avoids compilation errors on some older
- //compilers like MSVC 7.1
- template<class CT, class CB>
- struct common_member_class_pointer_to_member
- {
- typedef CT CB::* type;
- };
- template<class C1, class T1, class C2, class T2> struct composite_member_pointer_type<T1 C1::*, T2 C2::*>
- {
- private:
- typedef typename composite_pointer_type<T1*, T2*>::type CPT;
- typedef typename boost::remove_pointer<CPT>::type CT;
- typedef typename common_member_class<C1, C2>::type CB;
- public:
- typedef typename common_member_class_pointer_to_member<CT, CB>::type type;
- };
- } // namespace type_traits_detail
- } // namespace boost
- #endif // #ifndef BOOST_TYPE_TRAITS_DETAIL_COMPOSITE_MEMBER_POINTER_TYPE_HPP_INCLUDED
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