std::is_member_function_pointer
From cppreference.com
| 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.
Contents |
[edit] Template parameters
| T | - | a type to check |
[edit] Helper variable template
| template< class T > inline 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> |
[edit] 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> > {}; |
[edit] 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."); }
[edit] 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) |