boost库的智能指针shared_ptr结合容器vector的使用

将n个shared_ptr放在vector中，vector会保持每个shared_ptr的引用；vector销毁时，shared_ptr会自动销毁所持对象，释放内存

#include <iostream>#include <boost/shared_ptr.hpp>#include <vector>using namespace std;class A{public:A(int i):num(i){}int getNum() { return num; }~A() { cout << num << " destroy" << endl; }private:int num;};int main(){vector<boost::shared_ptr<A> > vsa;for(int i = 0; i < 5; ++i){boost::shared_ptr<A> x(new A(i));vsa.push_back(x);}for(size_t i = 0; i < vsa.size(); ++i){std::cout << vsa[i]->getNum() << " ";}cout << endl;}