[fpc-devel] Allow record helper inheritance in Delphi mode

[Ondrej Pokorny]

On 01.09.2017 12:15, Maciej Izak wrote:
> 2017-09-01 11:41 GMT+02:00 Stefan Glienke <sglienke at dsharp.org 
> <mailto:sglienke at dsharp.org>>:
>
>     Again you will cause unnecessary headaches because now your helper
>     has the dependency of the builtin and the third party one.
>     How would third party one and third party two implement them? They
>     both probably would extend the builtin one. Which one can you use
>     in your code then?
>     Yes, the one that comes last in the uses. What if you want to use
>     functions from both? Out of luck again.
>
>     Inheritance regardless what form is never is the best option here.
>     I think "ancestor list" is just a misnomer in the documentation as
>     it cannot be a list but only one in case of class helper.
>
>
> The control of modules order in uses section can turn programmers life 
> into real hell for type helpers. I think that new directive 
> $EXPLICITHELPERS should help :

That's effectively just another way to write:

TMyHelper = class helper (TH2, TH1) // scope for helpers limited to TH2, TH1

:P

Ondrej
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