[Xapian-tickets] [Xapian] #280: Review storage of parameters in Query

[Xapian]

#280: Review storage of parameters in Query
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 Reporter:  richard      |        Owner:  olly    
     Type:  enhancement  |       Status:  assigned
 Priority:  normal       |    Milestone:  1.1.0   
Component:  Library API  |      Version:  SVN HEAD
 Severity:  normal       |   Resolution:          
 Keywords:               |    Blockedby:          
 Platform:  All          |     Blocking:          
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Changes (by olly):

  * status:  new => assigned


Comment:

 I've actually looked at this already.

 A union doesn't help as much as you might hope as you can only put POD
 types in it.  So every object would still need to have a subqs member.  If
 new operators need a new non-POD type, then every operator pays the price.
 Also, every object has to be the same size (unless you under-allocate
 space, which is really nasty).  And a union is syntactically clumsy for
 the "shared" members (not significantly better than just using "parameter"
 I feel).

 Subclassing is almost certainly the better option, though ideally I think
 we want to try to get the internal class out of the external header first.
 I've not figured out how that could be done yet though...

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Ticket URL: <http://trac.xapian.org/ticket/280#comment:1>
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