From: saharbaugh%roo.dnet@WINNIE.BERKELEY.EDU
Subject: "BIG E vs little e", was pre-condition vs post-condition
Date: 16 Mar 91 14:31:31 GMT [thread overview]
Message-ID: <9103161431.AA07643@winnie.fit.edu> (raw)
Re: The discussion titled: "Pre-Condition vs Post-Condition"
Mike Feldman invites further discussion so here is a "war story":
In 1982 we were defining the Ada/GKS binding. The ANSI GKS spec
specified that an error code be returned to the caller (ala Fortran).
Our challenge was to determine which error codes would be
implemented in Ada as error codes and which error codes would be
implemented as Ada exceptions.
I defined a partitioning criteria I called "BIG E vs little e". A "little e"
would be a soft error such as the caller asking for a red polyline on a
monochrome workstation. A "BIG E" would be hard error such as the
caller asking for a red polyline on a workstation which is off-line.
Little e's allow the programmer to continue the train of thought
through the graphics program. BIG E's force the programmer the
break the train of thought and deal with an unexpected situation.
sam harbaugh saharbaugh%ROO.DNET@WINNIE.FIT.EDU
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