shared和unique的基础用法

#include <memory>
#include <iostream>
#include <vector>
#include <string>

using namespace std;

void main()
{
    shared_ptr<string>pNico(new string("Nico"));
    shared_ptr<string>pJutta(new string("Jutto"));
    //shared_ptr 's ctor is explicit,so "=" ==> ctor is impossible
    //replace & reset

    vector<shared_ptr<string>>vPNJ;

    vPBJ.push_back(pJutta);
    vPBJ.push_back(pJutta);
    vPBJ.push_back(pNico);
    vPBJ.push_back(pJutta);
    vPBJ.push_back(pNico);

    cout << "use_count:" << VPBJ[0].use_count() << endl;//4
    //because push_back copying of raw_shared_ptr, so, 4 = 3+1

    shared_ptr<string>pNico(new string("Nico"), [](string *p){
                                cout << "delete" << *p << endl;
                            });
    //这个P应该理解，调用~()，的原因，就应该是new  的 p 绑定的 delete

    //to array[]
    //没有默认的 dtor[],只能自定义
    //使用 unique_ptr的helper
    shared_ptr<string>pNico(new int[10],std::default_delete<int[]>());
    shared_ptr<string>pNico(new int[10],[](int*p){
                        delete[] p;
                    });

    //but unique_ptr 不一样
    //必须提供dtor的模板参数
    unique_ptr<int, void(*)(int*)>p(new int[10],[](int*p){
                        delete[] p;
                    })

}