如何扩展stl类有我自己的方法？ [英] How can I extend stl classes to have my own methods?

问题描述

我知道从stl类继承是一个坏的想法。但是有没有其他方法来扩展它们？

I know that it is a bad idea to inherit from stl classes. But is there any other way to extend them?

让我们说，为了提高可读性，我希望能够在我的向量上调用一个添加方法，而不是较少可读push_back。

Let's say that to improve readability, I wanted to be able to call an "add" method on my vectors instead of the less readable "push_back".

或者我想在我的std :: map中添加一个简单的hasKey方法。

Or perhaps I want to add a simple hasKey method to my std::map.

除了创建一个包含std :: vector作为成员的包装器类，将每个函数调用从我的包装传递给向量吗？

Is there any way that I could do that, aside from creating an entire wrapper class with a std::vector as a member, passing each function call from my wrapper to the vector?

推荐答案

您应该使用免费的函数：

You should use free functions:

template<typename... Args>
bool has_key(std::map<Args...> const& map, typename std::map<Args...>::key_type key) {
  return map.find(key) != map.end();
}

如果不是necesarry，不要使用继承。这很傻。

Don't use inheritance if it's not necesarry. That's silly.

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