Subtraction operators
Declared in <bslalg_dequeiterator.h>
Return an iterator pointing the element at the specified offset before this iterator.
DequeIterator<VALUE_TYPE, BLOCK_LENGTH>
operator-(std::ptrdiff_t offset) const;
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Return the distance between this iterator and the specified rhs iterator.
std::ptrdiff_t
operator-(DequeIterator const& rhs) const;
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