cpp-cast.cpp

class CBase {
	virtual void f() {} 
};
class CDerieve : public CBase {
	virtual void f() override {}
};

void CastTest()
{
	// dynamic cast with reference
	{
		CBase b;
		CDerieve &rD = dynamic_cast<CDerieve &>(b); // throw std::bad_cast
	}

	// const_cast는 떼거나 붙이거나 둘 다 가능.

	// C cast vs static_cast
	{
		unsigned char c;

		c = (unsigned char)int(256);
		std::cout << (int)c << std::endl; // 0

		c = static_cast<unsigned char>(int(257));
		std::cout << (int)c << std::endl; // 1

		c = (unsigned char)float(1.5f);
		std::cout << (int)c << std::endl; // 1

		c = static_cast<unsigned char>(float(1.6f));
		std::cout << (int)c << std::endl; // 1

		c = reinterpret_cast<unsigned char>(int(128)); // COMPILE ERROR
	}
	// reinterpret usage 1
	{
		int *pInt = nullptr;
		char *pChar = nullptr;

		pInt = (int *)pChar;
		pInt = reinterpret_cast<int *>(pChar);
		pInt = static_cast<int *>(pChar); // COMPILE ERROR

		pChar = (char *)pInt;
		pChar = reinterpret_cast<char *>(pInt);
		pChar = static_cast<char *>(pInt); // COMPILE ERROR
	}
	// reinterpret usage 2
	{
		short s = 2;
		char *p;

		p = (char *)s;
		p = reinterpret_cast<char*>(s);
		p = static_cast<char*>(s); // COMPILE ERROR

		s = (short)p;
		s = reinterpret_cast<short>(p);
		s = static_cast<short>(p); // COMMPILE ERROR

		std::cout << s << std::endl; // 2
	}
}