如何递增迭代器2？ [英] How to increment an iterator by 2?

问题描述

有人可以告诉我如何将迭代器增加2？

Can anybody tell me how to increment the iterator by 2?

iter ++ 做 iter + 2 ？如何实现这一点？

iter++ is available - do I have to do iter+2? How can I achieve this?

推荐答案

std :: advance（iter，2）;

为不是随机访问迭代器的迭代器工作，但是当与随机访问迭代器一起使用时，仍然可以通过实现专门化的迭代器的效率不低于 iter + = 2 。

This method will work for iterators that are not random-access iterators but it can still be specialized by the implementation to be no less efficient than iter += 2 when used with random-access iterators.

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