std::is_member_function_pointer (3) - Linux Manuals

std::is_member_function_pointer: std::is_member_function_pointer

NAME

std::is_member_function_pointer - std::is_member_function_pointer

Synopsis


Defined in header <type_traits>
template< class T > (since C++11)
struct is_member_function_pointer;


Checks whether T is a non-static member function pointer. Provides the member constant value which is equal to true, if T is a non-static member function pointer 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_function_pointer_v = is_member_function_pointer<T>::value;


Inherited from std::integral_constant

Member constants


value true if T is a member function pointer type , 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_function_pointer_helper : std::false_type {};


  template< class T, class U>
  struct is_member_function_pointer_helper<T U::*> : std::is_function<T> {};


  template< class T >
  struct is_member_function_pointer : is_member_function_pointer_helper< std::remove_cv_t<T> > {};

Example


// Run this code


  #include <type_traits>


  class A {
  public:
      void member() { }
  };


  int main()
  {
      // fails at compile time if A::member is a data member and not a function
      static_assert(std::is_member_function_pointer<decltype(&A::member)>::value,
                    "A::member is not a member function.");
  }

See also


is_pointer checks if a type is a pointer type
                         (class template)
(C++11)


is_member_object_pointer checks if a type is a pointer to a non-static member object
                         (class template)
(C++11)


is_member_pointer checks if a type is a pointer to an non-static member function or object
                         (class template)
(C++11)