A class forward_iterator that satisfies the requirements of a forward iterator for the value type T, supports the following operations.
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| Assignment. | ||
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| Test for equality: Two iterators are equal if they refer to the same item. | ||
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| Test for inequality. The result is the same as !(it == it1). | ||
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Returns the value of the iterator.
If forward_iterator is mutable *it = t is valid.
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Prefix increment operation.
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Postfix increment operation. The result is the same as that of
iterator tmp = it; ++it; return tmp;.
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