C++学习之路：share_from_thisT类的使⽤ 引⾔：当我们在类的内部需要定义⼀个指向 this ⾃⾝对象的智能指针时，会出现两个同指向智能指针分属两个系统的问题，导致析构的时候出现⼆次析构，程序就会挂掉。因为两个指针指向同⼀个对象，但是却不共享引⽤计数 那么在类内部如何获取指向⾃⾝对象的...
在类内部用 share_from_this() 获取智能指针可以 让类外部的 智能指针知道, 使其所有共对象的智能指针 共享计数, 文字描述十分绕, 我们看了代码就十分明了了; 1.举个例子,下面的代码在函数f内部通过this构造了shared_ptr对象,然后打印x_的值。 1classB {2public:3B(): x_(4) {4cout <<"B::B()"<...
而在构造函数里面调用share_from_this也会报错,因为对象还没构造完成 classnode:publicstd::enable_shared_from_this<node>{public:node(){mission_ptr pMission=std::make_shared<mission>(this->shared_from_this());//报错,应该在构造函数外的地方调用share_from_this}~node(){}};intmain(void){std::sha...
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