| description | Learn more about: is_object Class | ||
|---|---|---|---|
| title | is_object Class | ||
| ms.date | 11/04/2016 | ||
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| ms.assetid | b452ceea-5676-488f-925b-ab881126c387 |
Tests if type is an object type.
template <class Ty>
struct is_object;Ty
The type to query.
An instance of the type predicate holds false if the type Ty is a reference type, a function type, or void, or a cv-qualified form of one of them, otherwise holds true.
// std__type_traits__is_object.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
struct functional
{
int f();
};
int main()
{
std::cout << "is_object<trivial> == " << std::boolalpha
<< std::is_object<trivial>::value << std::endl;
std::cout << "is_object<functional> == " << std::boolalpha
<< std::is_object<functional>::value << std::endl;
std::cout << "is_object<trivial&> == " << std::boolalpha
<< std::is_object<trivial&>::value << std::endl;
std::cout << "is_object<float()> == " << std::boolalpha
<< std::is_object<float()>::value << std::endl;
std::cout << "is_object<void> == " << std::boolalpha
<< std::is_object<void>::value << std::endl;
return (0);
}is_object<trivial> == true
is_object<functional> == true
is_object<trivial&> == false
is_object<float()> == false
is_object<void> == false
Header: <type_traits>
Namespace: std