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self& operator--()
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<p>Post-decrement. </p>
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<p>This iterator after decremented. </p>
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self operator--(int)
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<p>Pre-decrement. </p>
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<p>Another iterator having the old value of this iterator. </p>
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<p>These functions are identical to those of <a class="link" href="db_map_base_iterator.html" title="Chapter 15. Db_map_base_iterator">db_map_base_iterator</a>
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<p>Actually the iterator movement functions in the four classes are the same. </p>
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