RE: interesting array "Feature"?

["Christen, Duane J." <dchristen@xxxxxxxxxxxxx>]

Thanks Barbara;

I did not expect this behaviour, altho it makes sense. If asked previously I
would have said that the compiler would   have chocked on it with a not
enough indexes error.

Thanks again.
Duane

-----Original Message-----
From: Barbara Morris [mailto:bmorris@xxxxxxxxxx]
Sent: Monday, July 12, 2004 12:01 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: interesting array "Feature"?


"Christen, Duane J." wrote:
> 
> I just came across an interesting bug in my code. (see below)  I have a
> function which returns a value and assigning that value to an array
element.
> I had not indexed the array correctly so the function was being "called"
for
> each element. It was finally failing because not all of the storage for
the
> array was allocated. I assume, altho I have not tried it, that if the
array
> would have been fully allocated that all elements would have been assigned
a
> return value from individual function calls.
> 
> The question would be: Is this an intended feature and can I expect this
> result in the future?
> I'm currently on V5R2M0.
> 

In general, if you do "array=value", every element gets the value.  When
"value" includes a call, the call gets made every time.  The exception
is for "array=arrayproc"; a procedure returning an array is only called
once.

I'm not sure about "intended feature", but this is the expected
behaviour.  Changing it would introduce an incompatibility if the called
procedure has side-effects; for example, it reads a file and returns a
different record on every call (I don't particularly think this is a
good thing to do, but it's possible).

A prototype keyword indicating that a procedure has no side effects
would be useful.

Barbara
    ===

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