ble border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>virtual function int prev (</td><td class=PTypePrefix nowrap>ref&nbsp;</td><td class=PType nowrap>KEY&nbsp;</td><td class=PParameter nowrap>key</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns the key of the previous item in the pool.</div></div><div class=CToolTip id="tt15"><div class=CClass><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td><table bord