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std::is_member_object_pointer(3) C++ Standard Libary std::is_member_object_pointer(3)


std::is_member_object_pointer - std::is_member_object_pointer


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_member_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)

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<
std::is_member_pointer<T>::value &&
> {};


// 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";


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)