std::is_member_pointer
From cppreference.com
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.
Contents |
Inherited from std::integral_constant
Member constants
value
[static]
|
true if T is a member 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)
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returns value (public member function) |
Member types
Type | Definition |
value_type
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bool
|
type
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std::integral_constant<bool, value> |
[edit] Possible implementation
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> {}; |
[edit] Example
This section is incomplete Reason: simplify |
Run this code
#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
[edit] See also
(C++11)
|
checks if a type is a pointer type (class template) |
(C++11)
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checks if a type is a pointer to a non-static member object (class template) |
(C++11)
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checks if a type is a pointer to a non-static member function (class template) |
(library fundamentals TS)
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variable template alias of std::is_member_pointer::value (variable template) |