On 30.04.2011 03:15, Paul Ishenin wrote:
30.04.2011 3:28, leledumbo wrote:
I see now that generics have improved a lot since latest release, we even
have Delphi compatible syntax in Delphi mode. Recursive generic type is
supported as well now (finally, I can continue my data structure library
:)). Seeing these facts, what's the status of this feature now? Is it
considered stable?--
No, they are not stable. FPC generic syntax may change. But you can rely
on delphi syntax (as we can't change it) with few limitations at the
moment:
- no multiply generics with the same identifier and different amount of
type parameters [1],
- no generic methods,
- no type constraints.
Also I may forgot something.
About [1] - in delphi it is possible to define different generics with
the same identifier and different amount of type parameteres (even in
the same unit). E.g.
TList = class ...; TList<T> = class ...; TList<T, TT> = class ...;
Then you can declare variables with any of that types. E.g.
var
L: TList;
LI: TList<Integer>;
LIO: TList<Integer,TObject>
As I know Sven will work to support this and other missing generics
features.
Point 1 is already on a good way - with backwards compatible FPC syntax
:) The only thing that still scares me are those nasty inline
declarations -.-
Type constraints (at least non-interface ones) should be rather easy to
do. The hardest part might be the parsing.
Regarding generic methods: I've already found the points where I'll need
to hook in and keep those in mind while extending/adjusting the existing
code, but that's it currently.
Regards,
Sven
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