From: RRACINE@USC-ISIF.ARPA (Roger Racine)
Subject: subaggragates
Date: Sun, 9-Feb-86 16:56:49 EST [thread overview]
Date: Sun Feb 9 16:56:49 1986
Message-ID: <8602092208.AA21059@ucbvax.berkeley.edu> (raw)
In regard to the following question:
Hi all,
We have a question concerning subaggregates. Consider the following
program...
procedure Agg is
type R is
record
X : String (1 .. 2) := (others => 'z');
Y : String (5 .. 6) := (others => 'z');
end record;
A : R;
begin
A := (others => (others => 'a'));
A := (X | Y => (others => 'a'));
A := ((others => 'c'), (others => 'c'));
end Agg;
Now the question is: Should any of these assignments raise
Constraint_Error? The Data General raises Constraint_Error on the
first two but not on the third. Is the subaggregate
(others => 'a')
in the first (and second) assignment evaluated once or twice?
Do things change if the components X and Y are of different lengths?
thanks in advance to anybody who has the slightest idea,
doug bryan and Geoff Mendal
-------
-----------------------------------------------------------------------
All three work fine on DEC's Ada compiler.
The "expression" (in your case 'a') is evaluated separately for
each component assigned (i.e. 4 times total per assignment statement).
It should not matter how many characters are in each string.
I hope that helps. I did not try to find the LRM paragraph,
but believe the DEC compiler is correct.
Roger Racine
-------
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