[fpc-devel] Variable can not be initialized by named constant
daniel.mantione at freepascal.org
Sun Mar 1 18:16:23 CET 2009
Op Mon, 2 Mar 2009, schreef Alexander Klenin:
> Since issue http://bugs.freepascal.org/view.php?id=13256 was marked resolved,
> I think this is quite reasonable to expect this to work.
> The writeability of constants is IMNSHO just an ugly leftover from
> Delphi history,
> and should be disabled in _both_ delphi and objfpc modes:
Making typed constants writeable has been a disputed feature of the
Borland dialect, I agree with that, but fact of the matter is they are
writeable and thus cannot form a constant expression. The fact that there
exists a $J directive does not change this.
There are some estethic arguments against this: allowing them into
initalization results in a break of the separation between declarations
and code Pascal has: The declaration suddenly gets an assignment statement
I forsee also practical problems: Procedure initialization code would
become much more complex. Rather than storing a fixed value in a variable
one would need to take care of dynamic types, like ansistring management.
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