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From: 18k11tm001@sneakemail.com (Russ)
Newsgroups: comp.lang.ada
Subject: Re: += in ada
Date: 22 Oct 2003 00:31:54 -0700
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Ole-Hjalmar Kristensen <ole-hjalmar.kristensen@substitute_employer_here.com> wrote in message news:<wvbroewasnv7.fsf@sun.com>...
> >>>>> "cg" == christoph grein <christoph.grein@eurocopter.com> writes:
> 
>     R> procedure P is
>     >> 
>  R> procedure Russ (X: in Boolean) is begin null; end Russ
>     >> 
>  R> X, Y: Boolean
>     >> 
>  R> begin
>     >> 
>  R> Russ (X = Y)
>     >> 
>     >> I think you have just illustrated his point ....
> 
>     cg> Who has illustrated whose point?
> 
> Russ( x = y ) is a very poor substitute for Russ(x=>y). I can only
> guess whether this means assignment of the local variable y to the
> local variable x followed by a call to Russ with the value y OR a
> binding of the local variable y to the formal parameter x of Russ.
> Given that I am reasonably fluent in both C++ and Ada, I would really
> be confused by this syntax.

It means exactly the same thing as "russ(x=>y)". It's just a cleaner
way to write it, exactly as it is done in Fortran and Python.

By the way, am I the only one who noticed that the arrow is backward
for this notation? The actual argument is getting put into the formal
argument, not vice versa. That is, y is getting put into x, so the
arrow should poing to the left: x<=y. I guess the right arrow was
adopted because <= is used for "less than or equal to." I  happen to
think that no arrow is better than an arrow pointing in the wrong
direction -- and its cleaner too.