[Xapian-tickets] [Xapian] #186: User subclassable classes should be reference counted

[Xapian]

#186: User subclassable classes should be reference counted
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 Reporter:  richard      |             Owner:  olly
     Type:  defect       |            Status:  assigned
 Priority:  normal       |         Milestone:  1.3.5
Component:  Library API  |           Version:  git master
 Severity:  normal       |        Resolution:
 Keywords:               |        Blocked By:
 Blocking:               |  Operating System:  All
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Comment (by olly):

 `LatLongMetric` objects are currently cloned by the objects they are set
 on, so don't need reference counting as things stand.

 I'm not entirely sure this cloning is a good idea - `Weight` objects
 support `clone()`, but they have to be cloned for each weighted subquery;
 `PostingSource` objects support `clone()`, but they need to be cloned for
 each subdatabase.  It seems `LatLongMetric` only supports `clone()` as a
 way to avoid holding a pointer/reference to an external `LatLongMetric`
 object, and making it optionally reference counted is more consistent and
 probably makes it a little simpler to implement your own metric.

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Ticket URL: <https://trac.xapian.org/ticket/186#comment:39>
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