Defined in header <type_traits> | ||
---|---|---|
template< class T > struct is_member_pointer; | (since C++11) |
If T
is pointer to non-static member object or a pointer to non-static member function, provides the member constant value
equal true
. For any other type, value
is false
.
T | - | a type to check |
template< class T > inline constexpr bool is_member_pointer_v = is_member_pointer<T>::value; | (since C++17) |
value
[static] | true if T is a member pointer type , false otherwise (public static member constant) |
operator bool | converts the object to bool , returns value (public member function) |
operator()
(C++14) | returns value (public member function) |
Type | Definition |
---|---|
value_type | bool |
type | std::integral_constant<bool, value> |
template< class T > struct is_member_pointer_helper : std::false_type {}; template< class T, class U > struct is_member_pointer_helper<T U::*> : std::true_type {}; template< class T > struct is_member_pointer : is_member_pointer_helper<typename std::remove_cv<T>::type> {}; |
#include <iostream> #include <type_traits> int main() { class cls {}; std::cout << (std::is_member_pointer<int(cls::*)>::value ? "T is member pointer" : "T is not a member pointer") << '\n'; std::cout << (std::is_member_pointer<int>::value ? "T is member pointer" : "T is not a member pointer") << '\n'; }
Output:
T is member pointer T is not a member pointer
(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 (class template) |
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