c++ - 从指向基类对象的指针 vector 调用派生类的独特函数

Question

#include <iostream>
#include <vector>

using namespace std;

class Base
{
public:
    void speak() { cout << "Hello!"; }
};

class Derived1 : public Base
{
public:
    void func1() { cout << "I'm a function!"; }
};

class Derived2 : public Base
{
public:
    void func2() { cout << "I'm also a function!"; }
};

int main()
{
    vector<Base*> v = { new Derived1(), new Derived2(), new Derived1(), new Derived2() //, ...
    };
    // For each Derived1 object invoke func1() and for each Derived2 object invoke func2()
}

Base 不是多态的(没有虚函数)。根据这些条件，我如何才能为 v 中的每个 Derived1 对象调用 func1 并为每个 Derived2 对象调用 func2？

Answer 1

"Base is not polymorphic (no virtual function)."

你仍然可以做 static_cast<Derived1>(v[0])/static_cast<Derived2>(v[1]) , a.s.o，只要您确定在特定索引处会得到什么。