Effective C++ .15,16获取原始资源和成对使用同类型new和delete

#include <iostream>
#include <cstdlib>
#include <memory>

using namespace std;

class Orange {
private:
    int weight;
public:
    Orange(int w) : weight(w) {}
    int getWeight() {return weight;}
};

int main() {
    shared_ptr<Orange> p(new Orange(123));
    Orange* ptr = p.get();
    ptr++;
    ptr--;
    cout<<ptr->getWeight()<<endl;
    return 0;
}