[C++] static_cast

/*
	기본 자료형의 형변환으로 컴파일 타임에 타입 변환
*/
#include <iostream>

int main()
{
	char ch;
	int i = 100;
	float f = 3.14;
	double d = 2.345;

	ch = static_cast<char>(i);		// int -> char로 타입 변환
	std::cout << ch << std::endl;
	ch = (char)i;					// C 스타일
	std::cout << ch << std::endl;

	d = static_cast<double>(f);
	std::cout << d << std::endl;

	i = static_cast<int>(d);
	std::cout << i << std::endl;

	std::cout << typeid(ch).name() << std::endl;
	std::cout << typeid(d).name() << std::endl;
	std::cout << typeid(i).name() << std::endl;

	return 0;
}
/*
	static_cast<type-id>(expression)
*/

#include <iostream>

class Base {
public:
	void func1() {
		std::cout << "Base::func1()" << std::endl;
	}
};

class Derived : public Base {
public:
	void func() {
		std::cout << "Derived::func()" << std::endl;
	}
	void func1() {
		std::cout << "Derived::func1()" << std::endl;
	}
};

class Derived2 : public Derived {
public:
	void func() {
		std::cout << "Derived2::func()" << std::endl;
	}
	void func1() {
		std::cout << "Derived2::func1()" << std::endl;
	}
};

int main()
{
	Base* bptr;
	Derived dobj;
	bptr = static_cast<Base*>(&dobj);		// upcasting
	bptr->func1();

	Base bobj;
	Derived* dptr;
	dptr = static_cast<Derived*>(&bobj);	// downcasting
	dptr->func();
	dptr->func1();

	Derived2* dptr2 = static_cast<Derived2*>(dptr);
	dptr2->func();
	dptr2->func1();
	
	return 0;
}