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Mailing lists / fpc-devel / 2018-11

Type range in generic

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Simon Jackson
 GENERIC GHandle<T, R> = CLASS
PROTECTED
it: Array [R] of T;
FUNCTION readIt(p: R): T; VIRTUAL;
PROCEDURE WriteIt(p: R; what: T); VIRTUAL;
PUBLIC
PROPERTY gimmeIt[p: R] READ ReadIt WRITE Writeit; DEFAULT; (* does this
work? x.y -> x.it.y *)
END;

Error: Error in type definition just after R on line 3.

http://www.kring.co.uk

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Sven Barth
to Simon Jackson

Am Sa., 1. Dez. 2018, 08:44 hat Simon Jackson
geschrieben:

Show quoted text 12 lines
GENERIC GHandle<T, R> = CLASS PROTECTED it: Array [R] of T; FUNCTION readIt(p: R): T; VIRTUAL; PROCEDURE WriteIt(p: R; what: T); VIRTUAL; PUBLIC PROPERTY gimmeIt[p: R] READ ReadIt WRITE Writeit; DEFAULT; (* does this work? x.y -> x.it.y *) END; Error: Error in type definition just after R on line 3.

Please report as a bug.

Regards,
Sven

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Sven Barth
to Ryan Joseph

Am So., 2. Dez. 2018, 10:50 hat Ryan Joseph
geschrieben:

Show quoted text 10 lines
> On Dec 2, 2018, at 4:00 PM, Sven Barth via fpc-devel < > wrote: > > Please report as a bug. I don’t get a bug on this in the trunk version I’m using. Maybe it was fixed?

Could be, I didn't test yet. But even then it can be resolved with "no change required". ;) (and be added as a test case)

Regards,
Sven

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Simon Jackson
to Sven Barth

Just an idea.

Class variables. If generics are used, then the same code can be used for differing pointer types. (Classes) as long as a specifier on the "generic class variable" and no generic specialize or is in the

class generic x: TObject;

Can it be shared across all generics of a kind?

The code density in the cache would be good for all common generics.

https://kring.co.uk

________________________________

Earlier message 19 lines
From: fpc-devel on behalf of Sven Barth via fpc-devel Sent: Sunday, December 2, 2018 4:01:44 PM To: FPC developers' list Cc: Sven Barth Subject: Re: [fpc-devel] Type range in generic Am So., 2. Dez. 2018, 10:50 hat Ryan Joseph geschrieben: > On Dec 2, 2018, at 4:00 PM, Sven Barth via fpc-devel wrote: > > Please report as a bug. I don’t get a bug on this in the trunk version I’m using. Maybe it was fixed? Could be, I didn't test yet. But even then it can be resolved with "no change required". ;) (and be added as a test case) Regards, Sven

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Ryan Joseph
to Simon Jackson
Show quoted text 11 lines
On Dec 3, 2018, at 6:33 AM, Simon Jackson wrote: Just an idea. Class variables. If generics are used, then the same code can be used for differing pointer types. (Classes) as long as a specifier on the "generic class variable" and no generic specialize or is in the class generic x: TObject; Can it be shared across all generics of a kind? The code density in the cache would be good for all common generics.

I don’t get what this is trying to accomplish or how it’s used. Example?

Regards,
Ryan Joseph

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Sven Barth
to Simon Jackson: Just an idea. Class variables. If generics are used, then the same code can be used for…

Am Mo., 3. Dez. 2018, 00:33 hat Simon Jackson
geschrieben:

Show quoted text 12 lines
Just an idea. Class variables. If generics are used, then the same code can be used for differing pointer types. (Classes) as long as a specifier on the "generic class variable" and no generic specialize or is in the class generic x: TObject; Can it be shared across all generics of a kind? The code density in the cache would be good for all common generics.

I don't see a use for such a feature.
What if one sets it as a descendant of one class, but another retrieves it as a descendent of a completely different class? You'd have to use separate storage locations then anyway and then you can simply use ordinary class variables.

Regards,
Sven

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