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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 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>The new iterator at new position. </p>
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<p><a class="link" href="stldb_vector_base_iteratoroperator_sub.html" title="operator-">db_vector_base_iterator::operator-(difference_type n) const</a>
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difference_type operator-(const self &itr) const
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<p>Iterator distance operator. </p>
<p>Return the index difference of this iterator and itr, so if this iterator sits on an element with a smaller index, this call will return a negative number. </p>
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<p>The other iterator to substract. itr can be the invalid iterator after last element or before first element, their index will be regarded as last element's index + 1 and -1 respectively. </p>
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<p>The index difference. </p>
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<p><a class="link" href="stldb_vector_base_iteratoroperator_sub.html" title="operator-">db_vector_base_iterator::operator-(const self& itr) const</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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