This class is available for the OPUS Blackboard API. The initial OPUS 2.0 release is described here

Description

This class is an abstract base class for all OPUS exceptions. Methods are included for generating string descriptions of the exception type and the object that is associated with the exception where applicable.

Example:

    #include 
    #include 
    #include 
    #include "opus_exceptions.h"

    //The following example demonstrates the throwing and catching of
    //OPUS exceptions
    int main(int argc, char* argv[])
    {
       try {
          string problem("This was the problem.");
          throw Bad_val(problem, problem);
       }
       catch(Opus_exception& oe) {
          cerr << "An OPUS exception occurred:" << endl;
          cerr << oe.which() << endl << oe.str() << endl;
       }
       try {
          errno = 5;
          throw Severe(errno, strerror(errno));
       }
       catch(Opus_exception& oe) {
          cerr << "An OPUS exception occurred:" << endl;
          cerr << oe.which() << endl << oe.str() << endl;
       }
       return(0);
    }

See Also:

• "OPUS API Blackboard and Support Classes Design Document"

Class: No_entry - Exception for missing data.

Synopsis

   No_entry(T, const string& = "");
   No_entry(const No_entry&);
   ~No_entry();

   string which() const;   // report info on exception type
   string str() const;     // report info on exception target

Description

This exception is thrown when a request for some data item failed because the item was not found.

Class: Bad_val - Exception for bad values.

Synopsis

   Bad_val(T, const string& = "");
   Bad_val(const Bad_val&);
   ~Bad_val();

   string which() const;   // report info on exception type
   string str() const;     // report info on exception target

Description

This exception is thrown when a passed in value is no good for its intended purpose.

Class: Type - Exception for improper types.

Synopsis

   Type(T, const string& = "");
   Type(const Type&);
   ~Type();

   string which() const;   // report info on exception type
   string str() const;     // report info on exception target

Description

This exception is thrown when an improper type was used in a call to a function.

Class: Io_error - Exception for I/O errors.

Synopsis

   Io_error(T, const string& = "");
   Io_error(const Io_error&);
   ~Io_error();

   string which() const;   // report info on exception Io_error
   string str() const;     // report info on exception target

Description

Class: Locked - Exception for locked resources.

Synopsis

   Locked(T, const string& = "");
   Locked(const Locked&);
   ~Locked();

   string which() const;   // report info on exception Locked
   string str() const;     // report info on exception target

Description

This exception is thrown when a requested resource is locked.

Class: Ambiguous - Exception for ambiguous operation.

Synopsis

   Ambiguous(T, const string& = "");
   Ambiguous(const Ambiguous&);
   ~Ambiguous();

   string which() const;   // report info on exception Ambiguous
   string str() const;     // report info on exception target

Description

This exception is thrown when a requested action cannot be completed due to some ambiguity.

Class: Severe - Exception for severe errors.

Synopsis

   Severe(T, const string& = "");
   Severe(const Severe&);
   ~Severe();

   string which() const;   // report info on exception Severe
   string str() const;     // report info on exception target

Description

This exception is thrown when processing stopped due to an unrecoverable condition.

Class: Not_ready - Exception for operations not ready to complete.

Synopsis

   Not_ready(T, const string& = "");
   Not_ready(const Not_ready&);
   ~Not_ready();

   string which() const;   // report info on exception Not_ready
   string str() const;     // report info on exception target

Description

This exception is thrown when a request cannot be completed because a critical item is not ready or initialized.

Class: Already - Exception for duplicate action requests.

Synopsis

   Already(T, const string& = "");
   Already(const Already&);
   ~Already();

   string which() const;   // report info on exception Already
   string str() const;     // report info on exception target

Description

This exception is thrown when a request for some data item has already been made or initialization is attempted more than once.

Class: Corrupt - Exception for corrupt data.

Synopsis

   Corrupt(T, const string& = "");
   Corrupt(const Corrupt&);
   ~Corrupt();

   string which() const;   // report info on exception Corrupt
   string str() const;     // report info on exception target

Description

This exception is thrown when data corruption is detected.

Class: Exec - Exception for execution failures.

Synopsis

   Exec(T, const string& = "");
   Exec(const Exec&);
   ~Exec();

   string which() const;   // report info on exception Exec
   string str() const;     // report info on exception target

Description

This exception is thrown when an attempt to execute some external task fails.

Class: File_action - Exception indicating a File_action is to be performed.

Synopsis

   File_action(T, const string& = "");
   File_action(const File_action&);
   ~File_action();

   string which() const;   // report info on exception File_action
   string str() const;     // report info on exception target

Description

This exception is thrown when a modification to some File_entry field detects that a FILE_ACTION command should be performed. The template contains the command label for the FILE_ACTION command on the Command Blackboard.

See Also: