Lucifers,
I started playing around with Rust and, naturally, I became interested in how
Rust bindings for Clownfish could be implemented. Here's a first sketch:
https://gist.github.com/nwellnhof/0c83c64a8f15c253e73e
Some notes:
The approach is somewhat similar to the Go bindings. Clownfish objects are
implemented as structs holding a raw C pointer to cfish_Obj.
Methods are implemented as default methods in a trait accompanying each class.
This trait inherits from the trait of the superclass. This way, we only have
to implement a method once.
The vtable lookup for method dispatch is reimplemented in Rust.
Rust doesn't offer the ability to freely cast between trait objects (like type
assertions in Go). So I implemented my own method to cast Clownfish objects
that uses cfish_Obj_is_a internally. Right now, this method is not only used
for downcasting but also for upcasting which is a bit inconvenient. We should
probably add helper methods for upcasting.
Nick
