Some read the sequence backward, thus requiring bidirectional iterators.
一些算法反向读取序列，所以要求双向迭代器。
Bidirectional iterators can be used anywhere an input or output iterator is required.
无论是需要输入迭代器还是输出迭代器，均可以使用双向迭代器。
Bidirectional iterators can be used anywhere that an input or output iterator is required.
无论是需要输入迭代器还是输出迭代器，均可以使用双向迭代器。
Bidirectional iterators can be used anywhere that a constant input or constant output iterator is required.
无论是需要常量输入迭代器还是常量输出迭代器，均可以使用双向迭代器。
Reverse bidirectional iterators can be used anywhere that a reverse input or reverse output iterator is required.
无论是需要反向输入迭代器还是反向输出迭代器，均可以使用反向双向迭代器。
Constant reverse bidirectional iterators can be used anywhere that a constant reverse input or constant reverse output iterator is required.
无论是需要常量反向输入迭代器还是常量反向输出迭代器，均可以使用常量反向双向迭代器。
Constant reverse bidirectional iterators can be used anywhere that a constant reverse input or constant reverse output iterator is required.
无论是需要常量反向输入迭代器还是常量反向输出迭代器，均可以使用常量反向双向迭代器。
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