Forward 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，均可以使用向前迭代器。
You can easily modify the Rope iterator to accommodate skipping forward by more than one character at a time.
很容易就能将Rope迭代器改成一次向前移动不止一个字符。
Subsequent invocations move the iterator backward or forward by the required distance.
后续的调用会将迭代器前后移动指定的距离。
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