std::is_member_object_pointer (3) - Linux Manuals

std::is_member_object_pointer: std::is_member_object_pointer

NAME

std::is_member_object_pointer - std::is_member_object_pointer

Synopsis

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. Provides the member constant value which is equal to true, if T is a non-static member object type. Otherwise, value is equal to false.

Template parameters

T - a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<T>::value;

Inherited from std::integral_constant

Member constants

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

Member functions

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

operator() returns value
              (public member function)
(C++14)

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<
                                        bool,
                                        std::is_member_pointer<T>::value &&
                                        !std::is_member_function_pointer<T>::value
                                    > {};

Example

 This section is incomplete
 Reason: simplify

// Run this code

  #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