Thread View: comp.lang.eiffel
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Started by day@grand.UUCP (
Wed, 21 Dec 1988 18:15
Widgets and Eiffel
Author: day@grand.UUCP (
Date: Wed, 21 Dec 1988 18:15
Date: Wed, 21 Dec 1988 18:15
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From: Vincent Phuah <vp01@gte.com>
Date: Tue, 15 Nov 88 16:04:16 EST
Using X Widgets in Eiffel
--------------------------
I assume it is fair to say that the graphic library in the current
release has a lot of glitches and doesn't work correctly at times.
While waiting for their next release, I am curious to
know whether there have been any success in
using the X Widget Sets (e.g. Athena and HP) in Eiffel.
Although Eiffel allows calls to external C routines, only basic C type
parameters can be passed between C and Eiffel. This severely limits
the type of external C routines that can be called. For example,
I think it is not possible to call the routines provided by the X Toolkit
because of the complex data structures that need to be passed
between these routines and Eiffel. Also, there is a further
complication when calling external C routines
which have "#include files" in them. Currently, there is no
facility in Eiffel to include these files which leads to
an interesting problem - how to call a external function which has
a return type defined in the "include files".
These are the few problems I have encountered so far.
Any solutions and/or input is welcome. Thanks.
Vincent Phuah
Software Technologies Dept.
GTE Laboratories
40 Sylvan Road
Waltham, MA 02254
Re: Widgets and Eiffel
Author: bertrand@hub.ucs
Date: Wed, 11 Jan 1989 22:23
Date: Wed, 11 Jan 1989 22:23
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In article <469@grand.UUCP>, Vincent Phuah <vp01@gte.com> wrote: > > -------------------------- > I assume it is fair to say that the graphic library in the current > release has a lot of glitches and doesn't work correctly at times. It is definitely fair to say that. We claim extenuating circumstances, however, since many of the glitches are due to X Windows (11.1). In fact, in the process of porting to X 11 release 3, a number of cases were uncovered in which the Eiffel classes had to be corrected because they were programmed around X 11.1 bugs which (fortunately) were fixed in the 11.3. This does not exonerate us totally (some of the glitches are definitely our responsibility), but anyone who has worked extensively with X, especially pre-11.3, will agree that this is not the best possible piece of software to use as a basis for development. Release 2.2 of Eiffel is based on X 11.3 and all the glitches mentioned should have disappeared. A number of improvements will also be included, in particular with respect to speed (menu display was too slow) and the possibility of having arbitrary client workstations. Also, the GOOD utility will work much more nicely. > Although Eiffel allows calls to external C routines, only basic C type > parameters can be passed between C and Eiffel. [... Other limitations > of the Eiffel to C interface] Making the Eiffel-to-C interface more flexible is another target of our current efforts. -- Bertrand Meyer Interactive Software Engineering bertrand@eiffel.com
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