TEnumerable.GroupBy With Delphi 12

[Esteban Lombardo]

Hi,

i'm migrating from Delphi 11 to Delphi 12 but i have some problem with Spring4D.

I use the TEnumerable.GroupBy function that take like parameter an enumberable and a generic function for keySelector.

The problem is that the old version of Spring4D take a TFunc<T, TKey> and the new version instead Func<T, TKey>.

What the difference between Func and TFunct?

thank you very much

[Stefan Glienke]

The difference is that Func from Spring.pas has const on all parameters while TFunc from SysUtils does not.

Depending on the type this has major performance implications.