std is_object Template in C++
Last Updated :
19 Nov, 2018
The std::is_object template of C++ STL is used to check whether the given type is object or not. It returns a boolean value showing the same.
Syntax:
template <class T > struct is_object;
Parameter: This template accepts a single parameter T (Trait class) to check whether T is a object type or not.
Return Value: This template returns a boolean value as shown below:
- True: if the type is a object.
- False: if the type is a non-object.
Below programs illustrate the std::is_object template in C++ STL:
Program 1::
#include <iostream>
#include <type_traits>
using namespace std;
int main()
{
class gfg {
};
cout << boolalpha;
cout << "is_object:" << endl;
cout << "sam: " << is_object<gfg>::value << '\n' ;
cout << "sam&: " << is_object<gfg&>::value << '\n' ;
cout << "int: " << is_object< int >::value << '\n' ;
cout << "int&: " << is_object< int &>::value;
return 0;
}
|
Output:
is_object:
sam: true
sam&: false
int: true
int&: false
Program 2::
#include <iostream>
#include <type_traits>
using namespace std;
int main()
{
class geeks {
};
cout << boolalpha;
cout << "is_object:" << endl;
cout << "float: " << is_object< float >::value << '\n' ;
cout << "float&: " << is_object< float &>::value << '\n' ;
cout << "raj: " << is_object<geeks>::value << '\n' ;
cout << "raj&: " << is_object<geeks&>::value << '\n' ;
cout << "char: " << is_object< char >::value << '\n' ;
cout << "char&: " << is_object< char &>::value;
return 0;
}
|
Output:
is_object:
float: true
float&: false
raj: true
raj&: false
char: true
char&: false
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