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From: rav@goanna.cs.rmit.oz.au (Robin Vowels)
Newsgroups: comp.lang.ada
Subject: Re: Why don't large companies use Ada?
Date: 7 Dec 1994 11:46:32 +1100
Organization: Comp Sci, RMIT, Melbourne, Australia
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Date: 1994-12-07T11:46:32+11:00
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	ok@goanna.cs.rmit.oz.au (Richard A. O'Keefe) writes:

>mfeldman@seas.gwu.edu (Michael Feldman) writes:
|>Yes, that's true. The transposition is mental. 
|>In my experience, interfacing between languages - certainly for the
|>kind of fairly simple vector/matrix interfaces the typical Fortranner
|>would use (the _subprograms_ aren't simple but the _interfaces_
|>tend to be) - is, to a very large extent,a matter of getting the
|>data structures to agree.

>I haven't used many PL/I compilers, but they all had "iSUB defining".
|I never used that feature myself, but you could describe it as exposing
|the linear subscript mapping at the source level.  The result is that
|you could have a direct and a transposed view of the _same_ array.
|I would have thought that made it fairly easy to interface PL/I to Fortran.
|PL/I had, back in the 70's when I met it, a great many data types that
|would not have mapped onto Fortran, but every Fortran variable _could_ be
|mapped into PL/I more or less directly (with the aid of iSUB defining for
|>=2-dimensional arrays).

>-- 
|"The complex-type shall be a simple-type."  ISO 10206:1991 (Extended Pascal)
|Richard A. O'Keefe; http://www.cs.rmit.edu.au/~ok; RMIT Comp.Sci.