[fpc-devel] RTTI module and "IsManaged" critical problem

Sven Barth pascaldragon at googlemail.com
Sat Dec 10 00:54:17 CET 2016

On 09.12.2016 22:57, Maciej Izak wrote:
> Hi,
> thanks Sven, finally we have initial RTTI.pas version on trunk. Let me
> start with first serious issue and eventually patch:
> function IsManaged(TypeInfo: PTypeInfo): boolean;
> IsManaged can't work with records because we need know managed fields
> count (in Delphi when ManagedFldCount is bigger than 0 it means that
> record has managed fields and problem is solved). Two possible (and IMO
> correct) solutions:
> 1. I think it's time to new position in "User Changes" wiki page. We can
> fix that by new behavior (a more Delphi compatible, more logical, more
> proper and a little incompatible with old code, but the risk is
> minimal): ManagedFldCount should be fixed/corrected as mentioned in
> http://bugs.freepascal.org/view.php?id=29767 (so it should count *real*
> managed field as the name "ManagedFldCount" suggests. Otherwise we can't
> implement this function. Btw. old behavior for ManagedFldCount will be
> not usefully anymore with RTTI module/improved TypInfo for counting all
> fields. 

We rename ManagedFldCount to TotalFieldCount, add a field
ManagedFieldCount and a property ManagedFldCount that returns
TotalFieldCount for backwards compatibility (and maybe marked as


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