Defines an iterator that can access elements in a container in the forward direction by using the increment operator and in the backward direction by using the decrement operator.

定义一个迭代器，该迭代器可以向前(通过使用递增运算符)或向后(通过使用递减运算符)访问容器中的元素。

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Elements can be accessed in the forward direction by using the decrement operator and in the backward direction by using the increment operator.

可以向前(通过使用递减运算符)或向后(通过使用递增运算符)访问元素。

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Interface for an iterator that can access elements in a container in the forward direction by using the increment operator and in the backward direction by using the decrement operator.

迭代器的接口，该迭代器可以向前(通过使用递增运算符)或向后(通过使用递减运算符)访问容器中的元素。

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