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Showing content from https://cplusplus.com/reference/type_traits/is_member_object_pointer/ below:

class template

<type_traits>

std::is_member_object_pointer

template <class T> struct is_member_object_pointer;

Is member object pointer

Trait class that identifies whether T is a pointer to a non-static data member.

It inherits from integral_constant as being either true_type or false_type.

Template parameters

T: A type.

Member types Inherited from integral_constant:

Member constants Inherited from integral_constant:
member constant definition value either true or false
Member functions Inherited from integral_constant:

operator bool: Returns value (public member function)

Example

// is_member_object_pointer example
#include <iostream>
#include <type_traits>

struct A { int x; };

int main() {
  int A::* pt = &A::x;
  std::cout << std::boolalpha;
  std::cout << "is_member_object_pointer:" << std::endl;
  std::cout << "A*: " << std::is_member_object_pointer<A*>::value << std::endl;
  std::cout << "int A::*: " << std::is_member_object_pointer<int A::*>::value << std::endl;
  std::cout << "decltype(pt): " << std::is_member_object_pointer<decltype(pt)>::value << std::endl;
  return 0;
}

Output:

is_member_object_pointer:
A*: false
int A::*: true
decltype(pt): true