Eiffel.An advanced introduction by Snyder A.A.

By Snyder A.A.

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This is because each routine has been fitted with a precondition that mandates that all arguments Eiffel: An Advanced IntroductionPage 59 be within reasonable bounds. For instance, any client who wishes to change the color of a VEHICLE object must pass as argument a value that is within the Red to Green range. Also, a change in the number of passengers via the set_num_passengers routine can not specify a negative number of passengers. We could also have required that one not attempt to set a ridiculously high number of passengers by specifying a limit to the new_num_passengers argument.

The clause here states that if the routine body do some_attribute := some_arg; fails to execute properly, or if the post-condition ensure some_attribute = some_arg; is not met, appropriate action should be taken. That action being the internal flag error_code_attribute be set to some_arg. The author could also have chosen to handle an above exception differently as seen fit. There is generally no right or wrong way to handle exceptions. The actions taken in a rescue clause should be based upon how severe the exception is, and how the programmer wishes to react to an exception.

For instance: class VEHICLE feature {DRIVER} identification : INTEGER; end declares that the feature identification is available only to clients who are either descendants of class DRIVER, or are themselves of class DRIVER. e. available to ANY class)? Since we did not explicitly redeclare the export status of identification when we inherited from VEHICLE, the status of this feature remains the same. However, we could have explicitly changed the export status of this, and any other inherited features for that matter, with the export clause: Eiffel: An Advanced IntroductionPage 37 class LAND_VEHICLE inherit VEHICLE export {DMV_PEOPLE} identification end; end; This states that any class wishing to use LAND_VEHICLE as a client, can only access identification directly if it is an heir of DMV_PEOPLE (of course, DMV_PEOPLE classes themselves may access identification).

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