Passing a derived class where base class is defined as ref parameter

[chopchop]

On Tuesday, 14 December 2021 at 20:58:21 UTC, Adam D Ruppe wrote:
> nice. You might want to look at my terminal.d 
> (arsd-official:terminal on dub) too which has pretty 
> comprehensive functionality for tons of things. Prolly more 
> than you need looking at your interface tho but it includes the 
> output functions then mouse and real time key inputs, get line 
> input, even scrollable areas and more.

Always a pleasure to check your great libs, I will have a look 
and learn probably a lot. But I wont use an external lib because 
it's a demo where all the code must be under contract / covered, 
to meet some strict coding standard. So in worst case I copy the 
code and add unittest / contract / invariant, etc. But original 
authors are always quoted and licences respected ;)