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::

// C++ program to illustrate 
// std::is_object template 
  
#include <iostream> 
#include <type_traits> 
using namespace std; 
  
// main program 
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::

// C++ program to illustrate 
// std::is_object template 
  
#include <iostream> 
#include <type_traits> 
using namespace std; 
  
// main program 
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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