| #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 |