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is_polymorphic template in C++

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The std::is_polymorphic template of C++ STL is used to checks whether the type is a polymorphic class type or not. It returns a boolean value showing the same.

Syntax:

template < class T > struct is_polymorphic;

Parameter: This template contains single parameter T (Trait class) to check whether T is a polymorphic class type or not.

Return Value:This template returns a boolean value as shown below:

  • True: if the type is a polymorphic class.
  • False: if the type is a non-polymorphic class.

Below programs illustrate the std::is_polymorphic template in C++ STL:

Program 1:




// C++ program to illustrate
// std::is_polymorphic template
  
#include <iostream>
#include <type_traits>
using namespace std;
  
struct gfg {
    virtual void foo();
};
  
struct geeks : gfg {
};
  
class raj {
    virtual void foo() = 0;
};
  
struct sam : raj {
};
  
int main()
{
    cout << boolalpha;
    cout << "is_polymorphic:"
         << '\n';
    cout << "gfg:"
         << is_polymorphic<gfg>::value
         << '\n';
    cout << "geeks:"
         << is_polymorphic<geeks>::value
         << '\n';
    cout << "raj:"
         << is_polymorphic<raj>::value
         << '\n';
    cout << "sam:"
         << is_polymorphic<sam>::value
         << '\n';
  
    return 0;
}


Output:

is_polymorphic:
gfg:true
geeks:true
raj:true
sam:true

Program 2:




// C++ program to illustrate
// std::is_polymorphic template
  
#include <iostream>
#include <type_traits>
using namespace std;
  
struct gfg {
    int m;
};
  
struct sam {
    virtual void foo() = 0;
};
  
class raj : sam {
};
  
int main()
{
    cout << boolalpha;
    cout << "is_polymorphic:"
         << '\n';
    cout << "gfg:"
         << is_polymorphic<gfg>::value
         << '\n';
    cout << "sam:"
         << is_polymorphic<sam>::value
         << '\n';
    cout << "raj:"
         << is_polymorphic<raj>::value
         << '\n';
  
    return 0;
}


Output:

is_polymorphic:
gfg:false
sam:true
raj:true


Last Updated : 19 Nov, 2018
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