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const self& operator-=(difference_type n)
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<p>Move this iterator forward by n elements. </p>
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<p>The amount and direction of movement. If negative, will move backward by |n| element. </p>
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<p>Reference to this iterator at new position. </p>
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<p><a class="link" href="stldb_vector_base_iteratoroperator_sa.html" title="operator-=">db_vector_base_iterator::operator-=(difference_type n)</a>
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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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