我改變了我的C++基類爲protected
繼承和我的dynamic_cast
(s)停止工作。爲什麼受保護的繼承導致dynamic_cast失敗?
爲什麼要改變繼承爲protected
改變dynamic_cast
的行爲?
struct Base {
static Base *lookupDerived(); // Actually returns a Derived * object.
};
struct Derived : protected /* Switch this to public to get it working */ Base {
static void test() {
Base *base = lookupDerived();
if (dynamic_cast<Derived *>(base)) {
std::cout << "It worked (we must be using public inheritance)." << std::endl;
} else {
std::cout << "It failed (we must be using protected inheritance)." << std::endl;
}
};