保活 std::enable_shared_from_this<Good>

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#include <memory> #include <iostream>    struct Good : std::enable_shared_from_this<Good> // 注意：继承 { public:     std::shared_ptr<Good> getptr() {         return shared_from_this();     }     ~Good() { std::cout << "Good::~Good() called" << std::endl; } };    int main() {     // 大括号用于限制作用域，这样智能指针就能在system("pause")之前析构     {         std::shared_ptr<Good> gp1(new Good());         std::shared_ptr<Good> gp2 = gp1->getptr();         // 打印gp1和gp2的引用计数         std::cout << "gp1.use_count() = " << gp1.use_count() << std::endl;         std::cout << "gp2.use_count() = " << gp2.use_count() << std::endl;     } }

　　

g++ -g -Wall -std=c++11 -pthread baohu.cpp -o baohu

[root@localhost test]# ./baohu
gp1.use_count() = 2
gp2.use_count() = 2
Good::~Good() called

 

【转】：https://blog.csdn.net/caoshangpa/article/details/79392878