BIND 10 #1857: make isc::config::ModuleSpecError a derived class of isc::Exception

[BIND 10 Development]

#1857: make isc::config::ModuleSpecError a derived class of isc::Exception
-------------------------------------+-------------------------------------
            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:                |  Sprint-Proposed
  configuration                      |                     Keywords:
           Sensitive:  0             |              Defect Severity:  N/A
         Sub-Project:  DNS           |  Feature Depending on Ticket:
Estimated Difficulty:  0             |          Add Hours to Ticket:  0
         Total Hours:  0             |                    Internal?:  0
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 Currently it's a direct derived class of std::exception:

 {{{#!c++
     /// A standard ModuleSpec exception that is thrown when a
     /// specification is not in the correct form.
     ///
     /// TODO: use jinmei's exception class as a base and not c_str in
     /// what() there
     class ModuleSpecError : public std::exception {
     public:
         ModuleSpecError(std::string m = "Module specification is invalid")
 : msg(m) {}
         ~ModuleSpecError() throw() {}
         const char* what() const throw() { return (msg.c_str()); }
     private:
         std::string msg;
     };
 }}}

 As noted in the comment we should make it a derived class of
 isc::Exception.  We often consider other std::exception outside of
 isc::Exception as a fatal error, so this can affect stability in case
 an error happens.

 Implementation-wise, this should be a trivial cleanup.

-- 
Ticket URL: <http://bind10.isc.org/ticket/1857>
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