保活 std::enable_shared_from_this<Good>

#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