| Defined in header <type_traits> | ||
|---|---|---|
template< class T > struct is_member_function_pointer; | (since C++11) |
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 > constexpr bool is_member_function_pointer_v = is_member_function_pointer<T>::value; | (since C++17) |
Inherited from std::integral_constant
Member constants
| value [static] | true if T is a member function pointer type , false otherwise (public static member constant) |
Member functions
| operator bool | converts the object to bool, returns value (public member function) |
| operator() (C++14) | returns value (public member function) |
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<
typename std::remove_cv<T>::type
> {}; |
Example
#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
| (C++11) | checks if a type is a pointer type (class template) |
| (C++11) | checks if a type is a pointer to a non-static member object (class template) |
| (C++11) | checks if a type is a pointer to a non-static member function or object (class template) |
| std::experimental::is_member_function_pointer_v_v
(library fundamentals TS) | variable template alias of std::is_member_function_pointer_v::value (variable template) |
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