connected returns true even as soon as the socket is initialized

[mireaulf]

The connected() function compares the internal ptr to null to see if it is connected, but ptr is initialized in init(...) which is called during construction.

[sigiesec]

The name is badly chosen, the function determines whether the socket has not been closed (which could be termed "open", although libzmq does not use that term IIRC).

Querying whether a socket is connected in the sense that connect has been called is not possible to implement.

I suggest to deprecate the function.

An open () function could be added, but I am not sure if there are valid use cases.

[kurdybacha]

+1 for deprecating the function