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std::is_poi...e_with_class(3) C++ Standard Libarystd::is_poi...e_with_class(3) NAME std::is_pointer_interconvertible_with_class - std::is_pointer_intercon- vertible_with_class Synopsis Defined in header <type_traits> template< class S, class M > constexpr bool is_pointer_interconvertible_with_class( M S::* mp ) (since C++20) noexcept; Given an object s of type S, determines whether s.*mp refers to a subobject of s and s is pointer-interconvertible with its subobject s.*mp. The program is ill-formed if S is not a complete type. If S is not a StandardLayoutType, or M is not an object type, or mp is equal to nullptr, the result is always false. Parameters mp - a pointer-to-member to detect Return value true if s.*mp refers a subobject of s and s is pointer-interconvert- ible with its subobject s.*mp, otherwise false, where s is an object of type S. 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. If there is a value mp of type M S::* such that std::is_pointer_interconvertible_with_class(mp) == true, then reinterpret_cast<M&>(s) has well-defined result and it refers the same subobject as s.*mp, where s is a valid lvalue of type S. On common platforms, the bit pattern of mp is all zero if std::is_pointer_interconvertible_with_class(mp) == true. Feature-test macro Value Std Feature Pointer-intercon- vertibility traits: __cpp_lib_is_pointer_interconvertible 201907L (C++20) * std::is_pointer_interconvertible_base_of, * std::is_pointer_interconvertible_with_class Example // Run this code #include <type_traits> struct Foo { int x; }; struct Bar { int y; }; struct Baz : Foo, Bar {}; // not standard-layout static_assert( not std::is_same_v<decltype(&Baz::x), int Baz::*> ); static_assert( std::is_pointer_interconvertible_with_class(&Baz::x) ); static_assert( not std::is_pointer_interconvertible_with_class<Baz, int>(&Baz::x) ); int main() { } See also is_standard_layout checks if a type is a standard-layout type (C++11) (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_poi...e_with_class(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | See also
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