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std::is_mem...ject_pointer(3) C++ Standard Libarystd::is_mem...ject_pointer(3)

NAME
       std::is_member_object_pointer - std::is_member_object_pointer

Synopsis
	  Defined in header <type_traits>
	  template< class T >		    (since C++11)
	  struct is_member_object_pointer;

	  Checks whether T is a	non-static member object pointer. Provides the
       member constant
	  value	 which	is  equal  to true, if T is a non-static member	object
       pointer type.
	  Otherwise, value is equal to false.

	  The behavior of a program  that  adds	 specializations  for  is_mem-
       ber_object_pointer
	  or is_member_object_pointer_v
	  (since C++17)	is undefined.

Template parameters
	  T - a	type to	check

	 Helper	variable template

	  template< class T >
	  inline      constexpr	     bool     is_member_object_pointer_v     =
       (since C++17)
	  is_member_object_pointer<T>::value;

       Inherited from std::integral_constant

Member constants
	  value	   true	if T is	a pointer to member object , false otherwise
	  [static] (public static member constant)

Member functions
	  operator bool	converts the object to bool, returns value
			(public	member function)
	  operator()	returns	value
	  (C++14)	(public	member function)

Member types
	  Type	     Definition
	  value_type bool
	  type	     std::integral_constant<bool, value>

Possible implementation
	  template<class T>
	  struct is_member_object_pointer : std::integral_constant<
						bool,
						std::is_mem-
       ber_pointer<T>::value &&
						!std::is_member_func-
       tion_pointer<T>::value
					    > {};

Example
       // Run this code

	#include <iostream>
	#include <type_traits>

	int main()
	{
	    class C {};
	    std::cout << "Is member object pointer?\n" << std::boolalpha
		      << std::is_member_object_pointer_v<int(C::*)>
		      << ": int(C::*)\n"
		      << std::is_member_object_pointer_v<int(C::*)()>
		      << ": int(C::*)()\n";
	}

Output:
	Is member object pointer?
	true: int(C::*)
	false: int(C::*)()

See also
	  is_pointer		     checks if a type is a pointer type
	  (C++11)		     (class template)
	  is_member_pointer	     checks if a type is a pointer to an  non-
       static member
	  (C++11)		     function or object
				     (class template)
	  is_member_function_pointer  checks  if a type	is a pointer to	a non-
       static member
	  (C++11)		     function
				     (class template)

http://cppreference.com		  2022.07.31	 std::is_mem...ject_pointer(3)

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