在std :: vector

Question

所以我有一个班级Base和一个班级Derived: public Base。

baseInstance.doSomething()将打印Base::doSomething()。

derivedInstance.doSomething()将打印Derived::doSomething()。

以下是代码：

#include "Base.h"
#include "Derived.h"
#include <vector>

int main(){
    Base base;
    std::cout<<"Base should do something:\n";
    base.doSomething();
    Derived derived;
    std::cout<<"\nDerived should do something:\n";
    derived.doSomething();
    std::vector<Base> vec;
    vec.push_back(derived);
    std::cout<<"\nDerived should do something:\n";
    vec[0].doSomething();
    return 0;
}

预期产出：

Base should do something:
Base::doSomething()

Derived should do something:
Derived::doSomething()

Derived should do something:
Derived::doSomething()

实际输出：

Base should do something:
Base::doSomething()

Derived should do something:
Derived::doSomething()

Derived should do something:
Base::doSomething()

如何在std::vector中保留班级类型？

编辑： 但是对象切片不会单独留下方法实现吗？并删除多余的字段？ 有没有办法环游这个？