delete operators with appropriate exception safety level for each, and greater efficiency for all. git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@146 7ec92016-0320-0410-acc4-a06ded1c099a
git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@108 7ec92016-0320-0410-acc4-a06ded1c099a
git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@33 7ec92016-0320-0410-acc4-a06ded1c099a