std::is_member_object_pointer - cppreference.com (original) (raw)

| | | | | -------------------------------------------------------- | | ------------- | | template< class T > struct is_member_object_pointer; | | (since C++11) |

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.

If the program adds specializations for std::is_member_object_pointer or std::is_member_object_pointer_v, the behavior is undefined.

Contents

• 1 Template parameters
• 2 Helper variable template
• 3 Inherited from std::integral_constant
  • 3.1 Member constants
  • 3.2 Member functions
  • 3.3 Member types
  • 3.4 Possible implementation
  • 3.5 Example
  • 3.6 See also

[edit] Template parameters

[edit] Helper variable template

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

Inherited from std::integral_constant

Member constants

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

Member functions

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

Member types

[edit] Possible implementation

[edit] Example

#include #include   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"; }

Output:

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

[edit] See also