[fpc-devel] Feature request/discussion - SetLengthNoInit

[J. Gareth Moreton]

Ah yes, that works, thanks.

I feel a bit silly because I haven't explored these useful features as 
much as I should, possibly because assembly language isn't object oriented!

I think the difficulty with getting things like this approved is that it 
crosses into the realm of defining the language itself.  I can't say I 
speak on behalf of Florian or Jonas, but I sense they want to avoid 
feature bloat that became a bit of an issue with Delphi.

Gareth aka. Kit

On 17/09/2020 04:03, Ryan Joseph via fpc-devel wrote:
>
>> On Sep 17, 2020, at 9:59 AM, J. Gareth Moreton via fpc-devel <fpc-devel at lists.freepascal.org> wrote:
>>
>> type generic TMyArray<T> = record
>>    Data: ^T;
>>    Length: PtrUInt;
>> end;
>>
>> The compiler will complain about T being an unresolved forward declaration.  Outside of specifying a second parameter for the pointer type (which would be a little unfriendly for third-party users), there isn't really a way around this.
>>
> To be clear all the features work but it's not as optimized as dynamic arrays and could be cumbersome with arrays of records.
>
> I think you're supposed to redeclare a pointer to T:
>
> type generic TMyArray<T> = record
>    type
>      TP = ^T;
>    public
>      Data: TP;
>      Length: PtrUInt;
> end;
>
>
> Regards,
> 	Ryan Joseph
>
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