• Zbigniew Kostrzewa (43/43) Dec 10 2010 Hi

Zbigniew Kostrzewa <zkostrzewa gmail.com> writes:

Hi

When I try to compile following two modules:

signal.d:
  1 static import std.signals;
  2
  3 class Signal(T...) {
  4   mixin std.signals.Signal!(T);
  5 }

task.di:
  1 import signal;
  2
  3 interface ITask {
  4   alias Signal!(int) OnCompleted;
  5
  6   void start();
  7   void stop();
  8   void connectOnCompleted(const OnCompleted.slot_t slot);
  9 }

I get errors like:
/usr/include/d/dmd/phobos/std/signals.d(199): Error: undefined identifier
_d_toObject
/usr/include/d/dmd/phobos/std/signals.d(200): Error: undefined identifier
rt_attachDisposeEvent
/usr/include/d/dmd/phobos/std/signals.d(216): Error: undefined identifier
_d_toObject
/usr/include/d/dmd/phobos/std/signals.d(217): Error: undefined identifier
rt_detachDisposeEvent
/usr/include/d/dmd/phobos/std/signals.d(234): Error: undefined identifier
_d_toObject
/usr/include/d/dmd/phobos/std/signals.d(259): Error: undefined identifier
_d_toObject
/usr/include/d/dmd/phobos/std/signals.d(260): Error: undefined identifier
rt_detachDisposeEvent

But when I import std.signals not using 'static' or when I adjust
std/signals.d module by prefixing calls to above methods with std.signals
everything compiles just fine.

Is it typical behavior when dealing with mixin templates or is it because
those methods are declared as extern (C) ? Or I made some mistake in the code
above ?

Since I don't want to forward std.signals to other modules that will import my
signal.d I thought about privately importing std.signals inside my Signal
class but I'm not sure it's the most appropriate solution to this issue (?)

Thanks in advance for any help with this.