C ++如何从包含的类调用父类方法？ [英] C++ how to call a parent class method from contained class?

问题描述

我想从一个包含的对象调用父类方法，但没有运气与下面的代码。

I am trying to make a call to a Parent class method from a contained object, but have no luck with the following code. What is the standard way to do it?

我已经搜索过，这似乎适用于继承的对象，但不适用于包含的对象。是不是称它为父类甚至是正确的？

I have searched around and this seems to work for inherited objects, but not for contained objects. Is it right to call it a Parent class even? Or is it called an Owner class?

class Parent{
private:
  Child mychild;

public:
  void doSomething();
}

class Child{
public:
  void doOtherThing();
}

void Child::doOtherThing(){
  Parent::doSomething();
}

推荐答案

访问包含它的类，并且通常不知道它包含。您需要以某种方式传递引用或指向包含类的指针 - 例如：

A contained object has no special access to the class that contains it, and in general does not know that it is contained. You need to pass a reference or a pointer to the containing class somehow - for example:

class Child{
public:
  void doOtherThing( Parent & p );
};

void Child::doOtherThing( Parent & p ){
   p.doSomething();
}

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