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

class template

<type_traits>

std::is_member_function_pointer

template <class T> struct is_member_function_pointer;

Is member function pointer

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

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_function_pointer example
#include <iostream>
#include <type_traits>

struct A { void fn() {}; };

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

Output:

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