abstract_class.hh
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	#include <iostream>
	class Animal {

	public:
	Animal(std::string name) { this->name = name; }
	virtual void scream() = 0;

	protected:
	std::string name;
	};

	class Cat : public Animal {

	public:
	Cat(const std::string &name) : Animal(name){};
	void scream() override { std::cout << name << ": MIAOU\n"; }
	};

	void makeItScream(Animal &a) { a.scream(); }

	int main() {
	// this will lead to compilation error
	Animal a("kitty");

	Cat c("kitty"); // ok
	Animal *ptr = &c; // ok
	Animal &ref = c; // ok

	makeItScream(c); // ok
	}