Daniël Mantione wrote:
Op Fri, 18 Jan 2008, schreef Vinzent Hoefler:
On Friday 18 January 2008 16:04, Michael Van Canneyt wrote:
On Fri, 18 Jan 2008, Daniël Mantione wrote:
Op Fri, 18 Jan 2008, schreef Michael Van Canneyt:
To the user, it may appear as a bunch of dots. To the compiler,
it doesn't know how to map the a.b.c.d:
Well, with normal Pascal rules, you cannot declare a variable with
the same name as a unit you use, because a unit is also an
identifier. Most logical would be to reject the declaration of
variable A in this case due to a duplicate identifier.
No, because the unit identifier is a.b.c, not a.
It has to be, otherwise units windows.messages and windows.records
would both have identifier windows, leading to an error.
Why? It would be in the uses clause, not in the declaration part. So
it's not "declaring" the same identifier twice.
Search for "unit identifier" in TP/Delphi books. "uses x" declares x as
unit identififier in the symtable of the current program/unit. So, it is
declared twice (with reason).
Well, but at that time there would be no confusion between a
"Windows.Messages" and "Windows.Constants". Both have to be units at
that point.
Maybe my view is skewed too much by the use of Ada where even a function
declares a "record identifier". In Ada it is even possible to do:
---
procedure Test is
X : Integer;
procedure B is
X : Integer;
begin
X := 1;
Test.X := 2; -- references X of "Test" procedure
end B;
begin
X := 3;
end Test;
---
Vinzent.
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