std::is_function
From Cppreference
| Defined in header <type_traits>
|
||
| template< class T >
struct is_function; |
(since C++11) | |
If T is function type (but not std::function, lambda expression or another callable object type), 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 function type , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
Member types
| Type | Definition |
| value_type | bool |
| type | std::integral_constant<bool, value> |
[edit] Example
#include <iostream> #include <type_traits> struct A {}; int f() { return 1; } int main() { std::cout << std::boolalpha; std::cout << std::is_function<A>::value << '\n'; std::cout << std::is_function<int(int)>::value << '\n'; std::cout << std::is_function<decltype(f)>::value << '\n'; std::cout << std::is_function<int>::value << '\n'; }
Output:
false true true false
[edit] See also
| (C++11)
|
checks if a type is object type (class template) |
| (C++11)
|
checks if a type is a class type (but not union type) (class template) |