On Sat, 26 Jan 2013, Sven Barth wrote:
Hello together!
Based on the results of the "for-in-index" thread I've decided to come up
with a draft for the Tuple type which is thought by many people to be a
better alternative to "for-in-index".
Please note the following points:
* This is not the final specification for Tuples and thus open to discussion
(there are still some issues with this draft that need to be solved)
* I won't implement this feature myself (at least not in the near future) as
I have other topics on my list (most importantly generics once type helpers
are commited), so Alexander is free to give the task for implementation to
his student.
After a first read, looks OK. You seem to have thought of everything that needs
to be described, except maybe extraction of a single element:
b : tuple of (integer, integer);
a : integer;
begin
b:=(1,2);
a:=b[0]; // a = 1 after this.
end;
In this sense, it seems more like an array of const than as a record.
I would not do the extensions. The tuple is simply a logical, immutable
grouping of values.
I would also not allow operators other than := <> and =, because in expressions,
when encountering a (, it is not clear what is meant.
Stick to what can be considered well-defined.
Michael.
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