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From: levi@localhost.nc3a.nato.int
Subject: array indexes
Date: 14 Oct 2001, 10:12:33

> Maurice Lombardi wrote:
> > 
> > either passed by value or by reference, for optimisation purposes,
> > and this is checked in the programs cstpar1.pas / cstpar2.pas
> > of the test suite.
> > Now both a value parameter or a var parameter is OK, only const complains.
> 
> I am new here, but an old hand at Pascal and Pascal
> implementation.
> 
> Will somebody please explain why this 'const' extension exists at
> all?  A non VAR parameter is always passed by value, so the
> original cannot be modified.  Thus I see absolutely no purpose to
> it.

For performance reasons I think, specially with larger structures.

Newer Delphi's  also have an OUT extension. (writeonly) to complete the
number of possibilities.
The reasons for that are afaik related to the Windows Api.

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