在 C++ 中，在构造期间使用“this"指针初始化类成员

In C++, initialize a class member with #39;this#39; pointer during construction(在 C++ 中，在构造期间使用“this指针初始化类成员)

问题描述

我想创建一个以某种父子关系关联到另一个类的类.为此，子"类需要对其父类的引用.

I'd like to create a class that is associated to another class in some sort of parent-child relationship. For this the "child" class needs a reference to it's parent.

例如:

template <typename T>
class TEvent {
    private: T* Owner;
    public: TEvent(T* parent) : Owner(parent) {}
};

class Foo {
    private: TEvent<Foo> Froozle; // see below
};

现在的问题是我不能直接初始化 Froozle 实例，也不能使用 Foo 的构造函数的实例化列表，因为那里不允许 this 引用.除了添加另一个方法 setParent(T*) (我不太喜欢它，因为这意味着我必须让 TEvent<> 实例无效state), 有没有办法做到这一点?

Now the problem is that I can't initialize the Froozle instance directly, nor using the instanciation list of Foo's constructor, because this references are not allowed there. Apart from adding another method setParent(T*) (which I don't like too much because it means that I have to leave the TEvent<> instance in an invalid state), is there a way to achieve this?

推荐答案

在初始化列表中使用this是可以的，只要不用来访问任何可能没有的成员尚未初始化.

It is OK to use this in the initialization list, as long as it is not used to access any members that may not have been initialized yet.

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