I was just working a bit on gintro for latest GTK4 and got a really confusing
error message.
Luckely I was just able to generate a minimal example, but I have still no real
idea what the problem may be. I guess there must be something special in this
code, because I have used similar constructs before and it was working fine...
type
Event* = ref object of RootRef
impl*: pointer
ignoreFinalizer*: bool
template fnew*(a: untyped; finalizer: untyped) =
when defined(gcDestructors):
new(a)
else:
new(a, finalizer)
proc `ref`*(self: Event): Event =
fnew(result, generic_gdk_event_unref)
echo "result.impl = gdk_event_ref(cast[ptr Event00](self.impl))"
proc generic_gdk_event_unref*[T](self: ref T) =
if not self.ignoreFinalizer:
echo "gdk_event_unref(self.impl)"
when defined(gcDestructors):
proc `=destroy`*(self: var typeof(Event()[])) =
if not self.ignoreFinalizer and self.impl != nil:
echo "gdk_event_unref(self.impl)"
self.impl = nil
proc main =
var x: Event
fnew(x, generic_gdk_event_unref)
main()
Run
$ nim c --gc:arc t2.nim
/tmp/hhh/t2.nim(21, 3) Error: cannot bind another '=destroy' to:
Event:ObjectType; previous declaration was constructed here implicitly:
/tmp/hhh/t2.nim(13, 3)
Run
$ nim -v
Nim Compiler Version 1.3.3 [Linux: amd64]
Compiled at 2020-05-11
Copyright (c) 2006-2020 by Andreas Rumpf
git hash: 7c24250a575b4d441ba6d7301714cbb246425fb6
active boot switches: -d:release
Run
