指向所有者类 [英] Pointer to owner class

问题描述

授予一个从自己的类型管理其子类的类，每个子类都有一个指针返回其父类。

Granted a class that manages its children from its own type, with each children having a pointer back to its parent.

class Class {
    std::array<std::shared_ptr<Class>, 4> children;
    std::weak_ptr<Class> parent;
}

A weak_ptr 像上面的代码，不工作，因为它必须通过共享ptr初始化。

A weak_ptr, like in the code above, does not work, because it has to be initialized through a shared ptr.

void initChild() {
    subtrees[0] = std::make_shared<Class>(std::shared_ptr<Class>(this));
}

这将明显删除 this 并导致错误。

This would obviously delete this and result in an error.

有没有可能有一个弱的引用父，而不使用原始的指针只有选项？

Is there any possibility to have a weak reference to the parent without using raw pointers, or would that be the only option?

推荐答案

如果你使用父指针作为一个可观察成员（即不是必须分配/销毁的东西） ，一个原始指针是唯一的出路。

If you are using the parent pointer as an observable member (i.e. NOT something that must be allocated/destroyed), a raw pointer is the only way to go.

这篇关于指向所有者类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！