My two cents

[Walter Bright]

On 10/24/2017 1:13 AM, Satoshi wrote:
> But it's quite useless to me.

That's what interfaces are for. Define your View and Button as interfaces. The 
implementations of interfaces are completely hidden from the derived class.


> But the worst part is that I need to hold di in sync to d files manually, so 
> there is not any advantages over C++'s header files.

dmd will generate the .di files for you with the -Hd switch. But I suggest using 
interfaces instead, which look ideal for your application.