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std::is_cor...ding_member(3) C++ Standard Libary std::is_cor...ding_member(3) NAME std::is_corresponding_member - std::is_corresponding_member Synopsis Defined in header <type_traits> template< class S1, class S2, class M1, class M2 > constexpr bool is_corresponding_member( M1 S1::* mp, M2 S2::* mq ) (since C++20) noexcept; Determines whether mp and mq refer corresponding members in the com- mon initial sequence of S1 and S2. The program is ill-formed if either S1 or S2 is an incomplete type. If either S1 or S2 is not a StandardLayoutType, or either M1 or M2 is not an object type, or either mp or mq is equal to nullptr, the result is always false. Parameters mp, mq - pointers-to-member to detect Return value true if mp and mq refer corresponding members in the common initial sequence of S1 and S2, otherwise false. Notes The type of a pointer-to-member expression &S::m is not always M S::*, where m is of type M, because m may be a member inherited from a base class of S. The template arguments can be specified in order to avoid potentially surprising results. Example // Run this code #include <type_traits> struct Foo { int x; double d; }; struct Bar { int y; double z; }; struct Baz : Foo, Bar {}; // not standard-layout static_assert( std::is_same_v<decltype(&Baz::x), int Foo::*> == true && std::is_same_v<decltype(&Baz::y), int Bar::*> == true && std::is_corresponding_member(&Foo::x, &Bar::y) == true && std::is_corresponding_member(&Foo::d, &Bar::z) == true && std::is_corresponding_member(&Baz::x, &Baz::y) == true && std::is_corresponding_member<Baz, Baz, int, int>(&Baz::x, &Baz::y) == false ); int main() {} See also is_standard_layout checks if a type is a standard-layout type (C++11) (class template) is_layout_compatible checks if two types are layout-compatible (C++20) (class template) is_member_object_pointer checks if a type is a pointer to a non-sta- tic member object (C++11) (class template) http://cppreference.com 2024.06.10 std::is_cor...ding_member(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | See also
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