BIND 10 #417: review: build error with clang++ for TSIG RDATA

[BIND 10 Development]

#417: review: build error with clang++ for TSIG RDATA
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  Reporter:  jinmei         |            Owner:  jinmei               
      Type:  defect         |           Status:  new                  
  Priority:  major          |        Milestone:  y2 12 month milestone
 Component:  DNSPacket API  |         Keywords:                       
 Sensitive:  0              |   Estimatedhours:  0                    
     Hours:  0              |         Billable:  1                    
Totalhours:  0              |         Internal:  0                    
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 Could someone take a quick check on the attached patch?

 clang++ doesn't like the current implementation of tsig_250.cc because it
 refers to TSIG::TSIGImpl (a private class internally defined in the TSIG
 class) outside the scope of the TSIG class.  The attached patch avoids
 this error in a straightforward way.

 I believe it's mostly trivial, but it may beyond the "too trivial" level,
 so I'm trying to get a review.  If it cannot get reviewed quickly (within
 a day or so) I'll merge it anyway.

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Ticket URL: <http://bind10.isc.org/ticket/417>
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