封装std :: map允许迭代，但是没有直接键访问? [英] Encapsulate std::map to allow iterating, but no direct key access?

问题描述

有没有一种方法可以将std::map封装在用户定义的类中，从而允许迭代，但不允许直接访问键?

Is there a way to encapsulate std::map within a user-defined class, allowing iteration, but not allowing direct access to the key?

我想在插入时操纵键，并且想通过用户定义的方法强制所有对元素的访问(因为键需要修改).

I would like to manipulate the key upon insertion and I want to force all access to elements through a user-defined method (as the key will need to be modified).

我认为问题在于允许迭代地图，同时阻止用户通过迭代器访问密钥.

I think the problem is allowing iterating over the map, whilst preventing the user from accessing the key via the iterator.

推荐答案

请勿公开迭代器.公开for_each函数，该函数将每个元素传递给用户提供的(lambda)函数.

Do not expose iterators. Expose a for_each function that passes each element to the user-provided (lambda) function.

或者，使用转换迭代器.

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