[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