C++智能指针实现类多态

智能指针让我们不再操心内存泄露的问题

类多态是面向对象的一大特性

普通指针可以实现类多态，智能指针同样也能，请看代码 

#include <iostream>
#include<vector>

class Base
{
public:
    virtual void show() = 0;
};
class A :public Base
{
public:
    virtual void show()
    {
        std::cout << "A show\n";
    }
};
class B:public Base
{
public:
    virtual void show()
    {
        std::cout << "B show\n";
    }
};
int main()
{
    std::vector<std::shared_ptr<Base> > pBaseVec;
    std::shared_ptr<Base> pA = std::make_shared<A>();
    std::shared_ptr<Base> pB = std::make_shared<B>();
    pBaseVec.push_back(pA);
    pBaseVec.push_back(pB);
    for (auto pBase : pBaseVec)
    {
        pBase->show();
    }

    return 0;
}