内部类访问外部类成员 [英] Inner Class access to Outer Class members

问题描述

我很困惑这个主题，基本上我有这个代码：

I'm very confused about this topic, basically I've this code:

template <typename T>
class SListArray
{
public:
    class const_iterator
    {
    public:
        const_iterator(size_t i_currentNode = -1)
            :m_position(i_currentNode)
        {
        }

        T const& operator*() const
        {
            return m_data[m_position].element;
        }

        // ...

    protected:
        size_t m_position;
    };

    explicit SListArray();

    // ...

private:
    std::vector<Node<T>> m_data;

    // ...
};

这段代码给我一个编译错误，所以，我想知道是否可以赋予Inner 。

This code give me a compiler error, so, I would to know if is possible to give the Inner Class the acces to the members of the Outer Class.

感谢。

推荐答案

嵌套类已经可以访问包含类的成员，假设它们有一个指针/引用要操作的包含类。您的迭代器将需要存储对外部类的引用，以便能够按照您的需要访问容器。

Nested classes already have access to the containing class's members, assuming they have a pointer/reference to the containing class upon which to operate. Your iterator will need to store a reference to the outer class in order to be able to access the container as you appear to want.

另请注意，受保护的数据通常是代码气味，通常应避免。如果适当，首选私人数据和受保护的接口。

Also note that protected data is usually a code smell and should typically be avoided. Prefer private data and a protected interface if appropriate.

编辑：除非这是严格地学习如何编写容器的练习，只需使用一个C ++标准容器作为向量，它们已经很好地开发，调试和优化。

Unless this is strictly an exercise to learn how to program a container, just use one of the C++ standard containers such as vector which are well developed, debugged, and optimized.

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