BIND 10 #2432: define and implement base and libdns++ version of RRsetCollection

[BIND 10 Development]

#2432: define and implement base and libdns++ version of RRsetCollection
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  libdns++                           |  Estimated Difficulty:  0
                   Keywords:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 Replying to [comment:1 vorner]:
 > Looking at the definition, would it be better to have some kind real
 iterator
 > than a foreach method with callback? I find the loop-by-callback
 > counter-intuitive.

 I don't know.  This reminds me of a discussion we had for the
 `RdataReader` class, and my sense is that this is a matter of
 preference.  I don't necessarily object to making it an iterator,
 but I don't necessarily think it's clearly a better choice either.

 If we could make it an STL-compatible iterator, I'd probably agree
 it's better, because the interface should be much more familiar for
 others and it can benefit from STL algorithms, etc.  Unfortunately, in
 this case this has to be a virtual interface, so this option is not
 easy (if not impossible).

 One possible idea I just come up with is:
 - introduce an STL-compatible iterator interface in the base class
   (this is not virtual).  this will be a forward iterator.
 - introduce some way that can work as a backend of the top level
   iterator in each class, maybe via protected methods

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Ticket URL: <http://bind10.isc.org/ticket/2432#comment:2>
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