std::is_function
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<metanoindex/>
<tbody> </tbody>| definiert in Header <type_traits>
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template< class T > struct is_function; |
(seit C++11) | |
Wenn
T Funktionstyp (aber nicht std::function, Lambda-Expression oder andere aufrufbare Objekttyp) ist, liefert das Element konstant value gleich true. Für jede andere Art, value ist false .Original:
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Inherited from std::integral_constant
Member constants
value [statisch] |
true wenn T is a function type , false anders Original: true if T is a function type , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
Member functions
operator bool |
wandelt das Objekt bool, gibt value Original: converts the object to bool, returns value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion) |
Member types
Type
Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
value_type
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bool
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type
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std::integral_constant<bool, value>
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Beispiel
#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