>
> I can write in-line handlers for this, but I'm trying to write a separate
> method, and just assign the method as a handler, and I can't seem to get the
> signature right.
It gets interesting when you want to also specify that the handler uses the
C calling convention to pass as a callback to legacy code. AFAICT you can’t
do that using a function, but you can when assigning a closure to a variable.
The handler winds up looking something like
let handler: @convention(c) UnsafeMutablePointer<Void> -> Void = {
arg in
// ...
}
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