C++: 동적 바인딩

개요

• 런타임에 동작을 결정

예제

• 코드

    #include <cstdlib>
    #include <ctime>
    #include <iostream>

    using namespace std;

    class Base {
    	public:
    		Base(){};
    		virtual ~Base() {}

    		virtual void func() { cout << "Base::func call" << endl; }
    };
    class Derived : public Base {
    	public:
    		Derived() : Base(){};
    		virtual ~Derived() {}

    		virtual void func() override { cout << "Derived::func call" << endl; }
    };

    int main() {
    	const int number = time(NULL) % 2;
    	cout << number << endl;

    	Base *base = NULL;
    	if (number) {
    		base = new Base;
    	} else {
    		base = new Derived;
    	}

    	base->func();

    	if (base != NULL) {
    		delete base;
    		base = NULL;
    	}

    	return 0;
    }

• 실행 결과 1

    0
    Derived::func call

• 실행 결과 2

    1
    Base::func call