What to do when you want to add attributes to your class functions?

[Kagamin]

To reduce template bloat declare implementation nontemplated:
```
void notify()
{
	shared me=cast(shared)this;
	me.notifyImpl();
}
void notify() shared
{
	notifyImpl();
}
void notify2() shared @nogc
{
	notifyImpl();
}
private void notifyImpl() shared @nogc
{
	code...
}
```