This problem appears also in std.signals.
There is no possibility to use functions with ref parameters as
signal handler.
import std.signals;
class Foo {
mixin Signal!(int);
}
class Bar {
void handler(ref int a) {}
}
void main() {
Foo foo = new Foo;
Bar bar = new Bar;
foo.connect(&bar.handler);
}
outputs:
Error: function signals.Foo.Signal!(int).connect (void
delegate(int) slot) is not callable using argument types (void
delegate(ref int a))|
Error: cannot implicitly convert expression (&bar.handler) of
type void delegate(ref int a) to void delegate(int)
