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):

 Another suggestion:
 {{{#!cpp
     /// \brief Returns a single character from the input source. If end
     /// of file is reached, -1 is returned.
     int getChar();
 }}}

 -1 is probably better than the "EOF" macro, but I'd also like to avoid
 using a magic number.  I suggest defining some static class constant
 to indicate this condition.

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Ticket URL: <http://bind10.isc.org/ticket/2369#comment:9>
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