如何覆盖c ++类像vector [英] How to override c++ class like vector

问题描述

我想覆盖向量类并添加一个自定义函数，但来自Java我不太熟悉重写，继承和那种东西的机制。

I'm trying to override the vector class and add a custom function to it, but coming from Java I'm not really familiar with the mechanics of overriding, inheriting and that kind of stuff.

推荐答案

标准容器不是多态的，因此你不能覆盖它们的行为;并没有受保护的成员，所以没有继承他们来延伸他们的点。

The standard containers aren't polymorphic, so you can't override their behaviour; and have no protected members so there's no point inheriting from them to extend them.

虽然你可以这样做，如另一个答案所建议的，你必须重新实现所有的构造函数（或者，自2011年以来，明确继承它们） t继承;并且有一种危险，有人对它进行多态处理，例如，当类不支持基类时，通过指向基类的删除。

While you could do that, as suggested by another answer, you would have to reimplement all the constructors (or, since 2011, explicitly inherit them), since those aren't inherited; and there's a danger of someone treating it polymorphically, for example deleting via a pointer to the base class, when the class doesn't support that.

在公共接口上操作的非成员函数：

Instead, add functionality through non-member functions operating on the public interface:

template <typename T>
void frobnicate(std::vector<T> & v) {for (auto & x : v) frobnicate(x);}

更一般地，遵循标准库的示例，并编写在一般迭代器范围内运行的模板：

More generically, follow the example of the standard library and write a template operating over a general iterator range:

template <typename InputIterator>
void frobnicate(InputIterator begin, InputIterator end) {
    while (begin != end) frobnicate(*begin++);
}

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