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AudacityException is an abstract base class for exceptions generated by Audacity. GuardedCall wraps any function (usually a lambda) in an appropriate catch block. It can also accept a second function that defines a catch block action, which can rethrow or return a value for the GuardedCall. It can also accept a third function, that defines another, delayed action that executes in the main thread at idle time if the second function intercepts an AudacityException and completes without rethrow. Defaults for the second function simply return void or false. Default for the third function invokes a virtual method of AudacityException, which for subclass MessageBoxException, displays a message box.