| description | Learn more about: is_function Class | ||
|---|---|---|---|
| title | is_function Class | ||
| ms.date | 02/21/2019 | ||
| f1_keywords |
|
||
| helpviewer_keywords |
|
||
| ms.assetid | e5c0dbcd-829b-415f-853f-8c5be47c5040 |
Tests if type is a function type.
template <class Ty>
struct is_function;Ty
The type to query.
An instance of the type predicate holds true if the type Ty is a function type, otherwise it holds false.
// std__type_traits__is_function.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
struct functional
{
int f();
};
int main()
{
std::cout << "is_function<trivial> == " << std::boolalpha
<< std::is_function<trivial>::value << std::endl;
std::cout << "is_function<functional> == " << std::boolalpha
<< std::is_function<functional>::value << std::endl;
std::cout << "is_function<float()> == " << std::boolalpha
<< std::is_function<float()>::value << std::endl;
return (0);
}is_function<trivial> == false
is_function<functional> == false
is_function<float()> == true
Header: <type_traits>
Namespace: std