std::is_member_object_pointer

template< class T >
struct is_member_object_pointer;

std::is_member_object_pointer is a UnaryTypeTrait.

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 std::is_member_object_pointer or std::is_member_object_pointer_v is undefined.

Template parameters

Helper variable template

template< class T >
inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<T>::value;

Possible implementation

template<class T>
struct is_member_object_pointer : std::integral_constant<
                                      bool,
                                      std::is_member_pointer<T>::value &&
                                      !std::is_member_function_pointer<T>::value
                                  > {};

Example

#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";
}

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

See also