BIND 10 #290: review: suggestion of minor improvement to datasrc/cache

[BIND 10 Development]

#290: review: suggestion of minor improvement to datasrc/cache
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  Reporter:  jinmei       |            Owner:                             
      Type:  defect       |           Status:  new                        
  Priority:  trivial      |        Milestone:  06. 4th Incremental Release
 Component:  data source  |         Keywords:                             
 Sensitive:  0            |   Estimatedhours:  0                          
     Hours:  0            |         Billable:  1                          
Totalhours:  0            |         Internal:  0                          
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 Please review the attached patch (very small).

 It requires knowledge about a bit less common method of std::list, but
 should work much faster than erase-then-push_front for moving an entry
 to the head of the list (a benchmark indicates it can run 3 times
 faster).

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Ticket URL: <http://bind10.isc.org/ticket/290>
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