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
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