std::is_member_object_pointer

From Cppreference

Defined in header `<type_traits>`

template< class T > struct is_member_object_pointer;		(C++11 feature)

If T is pointer to non-static member object, provides the member constant value equal true. For any other type, value is false.

Inherited from std::integral_constant

Member constants


`value`	true if `T` is a pointer to member object , false otherwise (public static member constant)

Member functions


`operator bool`	converts the object to bool, returns `value` (public member function)

Member types


Type	Definition

`value_type`	`bool`

`type`	std::integral_constant<bool, value>

[edit] Equivalent definition

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
                                  > {};

[edit] Example

#include <iostream>
#include <type_traits>
 
int main() {
    class cls {};
    std::cout << (std::is_member_object_pointer<int(cls::*)>::value
                     ? "T is member object pointer"
                     : "T is not a member object pointer") << '\n';
    std::cout << (std::is_member_object_pointer<int(cls::*)()>::value
                     ? "T is member object pointer"
                     : "T is not a member object pointer") << '\n';
}

Output:

T is member object pointer
T is not a member object pointer

[edit] See also

is_pointer (C++11)

checks if a type is a pointer type
(class template)

is_member_pointer (C++11)

checks if a type is a pointer to a non-static member function or object
(class template)

is_member_function_pointer (C++11)

checks if a type is a pointer to a non-static member function
(class template)