On 28/01/2019 12:47 pm, Jim Mulder wrote:
It is unfortunate that IBM does not make PL/X (which
has object-oriented capabilities) available
to ISVs.
Is OO PL/X still being used for active development at IBM? I can
remember a conversation I had with a guy from Hursley who told me OO
PL/X was
buggy and inefficient. With typical British humour they had renamed it
"ooh ooh" PL/X! It may have been fixed since then but the complaints
were many. Code quality/bloat was a problem as was "Is-A" hell which
resulted in difficult to understand code. Bugs were not fixed promptly
so they ditched
it and used vanilla PL/X.
Overuse of inheritance has been a big problem with OO code for decades
which is why it's avoided these days unless it really is "Is-A" and not just
code reuse using the wrong tool for the job.
C++ is not suitable for low-level code on z/OS because of LE. The
debugging aids like the traceback are fantastic for fixing easy problems
but when it gets
tricky IPCS is still the go and the LE condition handlers get in the
way. But IMO it's a fantastic language for writing problem state ISV
applications.
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