问题描述
在以下代码中,如何从类 AbsBase::trycallmebase()
的实例调用方法 Derived
? (从两个班级外调用)
#include <iostream>
// Abstract base class
class AbsBase {
public:
virtual void implement_me()=0;
virtual void trycallmebase() { std::cout << "AbsBase::trycallmebase() \n"; }
};
// Concrete class
class Derived : public AbsBase {
public:
virtual void implement_me() { std::cout << "Derived::implement_me() \n"; }
virtual void trycallmebase() { std::cout << "Derived::trycallmebase() \n"; }
};
int main() {
Derived derived;
AbsBase* absbase = &derived;
// try 1 : OK
derived.trycallmebase();
// try 2 : OK (virtual call in action)
absbase->trycallmebase();
// try 3 : Expected to print "AbsBase::trycallmebase()"
static_cast<AbsBase*>(&derived)->trycallmebase();
}
解决方法
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