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self operator+(difference_type n) const
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<p>Iterator movement operator. </p>
<p>Return another iterator by moving this iterator backward by n elements. </p>
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<p>The amount and direction of movement. If negative, will move forward by |n| element. </p>
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<p>The new iterator at new position. </p>
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<p>These functions have identical behaviors and semantics as those of <a class="link" href="db_vector_base_iterator.html" title="Chapter 12. Db_vector_base_iterator">db_vector_base_iterator</a>
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