On Friday 07 March 2008 02:50 am, Johan Torp wrote:
A typical signals n' slots use case is - at least for me:
signal<void()> sig;
class Foo{ Foo() { con = sig.connect(bind(&Foo::some_func, this)); }
scoped_connection con;
void some_func() {} };
To have the connection disconnect on the Foo object's destruction, you're supposed to pass a shared_ptr owning the object (either directly or indirectly) to slot::track() before connecting the slot. This insures the object is not destroyed while a slot invocation is in progress (the signal converts its weak_ptr copy to a shared_ptr while the slot runs), and disconnects the slot when the tracked weak_ptr expires. It does have the drawback that you often can't track connections made in the constructor though, since enable_shared_from_this doesn't work there. I did provide postconstructible/deconstruct_ptr to support postconstructors, although it does all add up to a bit more typing. I've attached an altered version of your example which does what I've described. -- Frank