BIND 10 #2369: InputSource helper class for MasterLexer

[BIND 10 Development]

#2369: InputSource helper class for MasterLexer
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                   Reporter:         |                 Owner:  muks
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20121106
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  libdns++                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 A couple of additional comments:

 - As you may have noticed I ended up using (shared) pointers of
   `InputSource` to hold them in a vector in `MasterLexer`.
   So, if name_ can be initialized in the member initialization list,
   it can (and should) be const.
 - I suggest renaming "inputsource.{h,cc}" something more specific.
   Just saying "input source" sounds too generic.

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Ticket URL: <http://bind10.isc.org/ticket/2369#comment:8>
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