On Thu, Aug 13, 2020 at 8:37 PM Beka Westberg <bekawestb...@gmail.com> wrote:
>
> Hello! I just ran into a problem that is solved really nicely with the new
> generics proposal and I thought someone might find it interesting :D
>
> I was trying to implement a library for doing ascii art programmatically. The
> main struct is basically an image.Image except it works with bytes instead of
> colors. As such you /should/ be able to create functions (like a flood fill
> algorithm) that are abstracted over both of these types, but without
> "generics" this cannot be done (with compile time type safety).
>
> I sketched a little project in the go2go playground that implements generic
> functions for doing Porter-Duff compositions on any types that fulfill the
> following constraint:
>
> ```
> type Rect(type T comparable) interface {
> At(x, y int) T
> Set(x, y int, t T)
> }
> ```
>
> Type defs on lines [8, 13]. Porter-Duff implementation [15, 99] Main [101,
> 108] ByteImg implementation [110, 185]
>
> I liked this example because it requires passing a generic function (the
> Porter-Duff func) to another generic function (Merge) :D I hope someone else
> finds it interesting as well!
Thanks for the example.
Ian
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