C++ : Pure virtual functions ( Interfaces )

main.cpp

#include <iostream>
#include <string>

struct IDescription
{
	virtual std::string get_description() = 0;
	
};

struct Gallery : public IDescription
{
	std::string get_description() override
	{
		return "I am gallery.";
	}
};

struct Airport : public IDescription
{
	std::string get_description() override
	{
		return "I am airport.";
	}
};

void display(IDescription& description)
{
	std::cout << description.get_description() << std::endl;
}

int main()
{
	//IDescription decripton; // It's an interface we can instanciate it

	Gallery galley;
	Airport airport;
	display(galley); // airport
	display(airport); // description
}