gistfile1.cpp

#include <string>

struct Base {
	enum Type {
		BASE,
		CHILD,
	};

	int i;
	virtual std::string getType() = 0;
	virtual Type getEnumType() = 0;
};

struct Child : public Base {
	int j, k;
	std::string getType();
	Type getEnumType();
};

std::string Child::getType() {
	return std::string("Child");
}

Base::Type Child::getEnumType() {
	return CHILD;
}

Child* cp;

void dynamic_foo(Base* p) {
	Child* q;
	if (q = dynamic_cast<Child*>(p)) {
		cp = q;
	}
}

void stringy_foo(Base* p) {
	if (p->getType() == "Child") {
		Child* q = static_cast<Child*>(p);
		cp = q;
	}
}

void enummy_foo(Base* p) {
	if (p->getEnumType() == Base::CHILD) {
		Child* q = static_cast<Child*>(p);
		cp = q;
	}
}

int main() {
	Child c;

	for (int i = 0; i < 1e8; ++i) {
#ifdef DYNAMIC
		dynamic_foo(&c);
#elif STRING
		stringy_foo(&c);
#elif ENUM
		enummy_foo(&c);
#endif
	}
}