what is abstract class in c++
when we use abstract classes? supposably we have class Car.
you don't want to use it directly. you need extend this class.
thats why you must declare this class as abstract.
then you only can extend this class with all methods.what is abstract class in c++
//Code by Soumyadeep Ghosh
//insta : @soumyadepp
//linked in : https://www.linkedin.com/in/soumyadeep-ghosh-90a1951b6/
#include <bits/stdc++.h>
using namespace std;
class person
{
string p_id;
public:
virtual void get_info()=0; //declaring person as abstract class
virtual void show()=0;
};
class student:public person
{
string name;
int roll_no;
public:
/*overriding the pure virtual function declared in base class otherwise
this class will become an abstract one and then objects cannot be created
for the same*/
void get_info()
{
cout<<"Enter name of the student "<<endl;
cin>>name;
cout<<"Enter roll number of the student "<<endl;
cin>>roll_no;
}
void show()
{
cout<<"Name : "<<name<<" Roll number: "<<roll_no<<endl;
}
};
int main()
{
person *p;
p=new student;
p->get_info();
p->show();
return 0;
}abstract class in c++
struct Abstract {
virtual void f() = 0; // pure virtual
}; // "Abstract" is abstract
struct Concrete : Abstract {
void f() override {} // non-pure virtual
virtual void g(); // non-pure virtual
}; // "Concrete" is non-abstract
struct Abstract2 : Concrete {
void g() override = 0; // pure virtual overrider
}; // "Abstract2" is abstract
int main()
{
// Abstract a; // Error: abstract class
Concrete b; // OK
Abstract& a = b; // OK to reference abstract base
a.f(); // virtual dispatch to Concrete::f()
// Abstract2 a2; // Error: abstract class (final overrider of g() is pure)
}cpp make class abstract
struct Abstract
{
virtual ~Abstract() = 0;
};
Abstract::~Abstract() {}
struct Valid: public Abstract
{
// Notice you don't need to actually overide the base
// classes pure virtual method as it has a default
};
int main()
{
// Abstract a; // This line fails to compile as Abstract is abstract
Valid v; // This compiles fine.
}Copyright © 2021 Codeinu
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