**@Swend**
> `class MyClass*:` results in an error "Error: expression expected, but found
> ':'", and I haven't found a good way around it.
You actually can get that syntax to work like this:
class Foo as object:
...
class Bar* as ref object:
...
That said, it's annoying and there's one big flaw with using a class macro like
that right now: interdependent types can only be defined in a type section.
However, we can do OOP in Nim just fine in a more "Rust like" fashion. Eg:
type
Person = object
name: string
age: float
impl Person:
proc greet =
echo "Hello, I am ", name, "."
echo "I'm ", age, " years old."
var bob = Person(name:"Bob", age:45)
bob.greet()
This way has a couple of advantages over the `class` macro:
* Uses standard type syntax.. so interdependent types work, and you don't
need to deal with `*` marks.
* You can define procedures from multiple modules with the `impl` macro.
* You can extend the macro to do fancy things for your application. Eg, `impl
MyButton as GuiItem`, `impl Player in Stage2.DangerZone`, etc..
Here's some working [example
code.](https://gist.github.com/PhilipWitte/f4f0c18f7f6436ee87dc3c506343d859) of
an `impl` macro. It needs to be improved a bit to support generics.. but it
might help you start.
