is_object Class
The latest version of this topic can be found at is_object Class.
Tests if type is an object type.
Syntax
template <class Ty>
struct is_object;
Parameters
Ty
The type to query.
Remarks
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.
Example
// std_tr1__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
Requirements
Header: <type_traits>
Namespace: std