Free all allocated memory blocks

to be called under lock

Connect new slot to the signal May throw exception if memory allocation fails Must be called under write_access() protection

* connect(slot) method subscribes slot to signal emission event. * Each time you call signal as functor, all slots are also called with given argume

Operator to add a new function or lambda as signal handler, returns a handler connection ID.

Operator to add a new function or lambda as signal handler, returns a handler connection ID.

Check whether slot is connected to the signal Must be called under read_access() protection

@returns `true` if the connection is connected to a signal object, and `false` otherwise.

Construct connection