The socket_status struct wraps the return value from the network operations and provides an operator bool():

Unfortunately, this makes the following code behave rather unobvious:

auto status = my_sock.recv(...);
if (status != socket_status::valid) { cout << "Error!"; }

One is tempted to think that this code checks whether status is socket_status::valid, but this is not what happens. At least under MSVC, this is equivalent to

if (status.operator bool() != static_cast<bool>(socket_status::valid))

which basically turns it into a check if the resulting status is positive (i.e. valid, wouldblock, connection closed etc.).

In

I am not entirely sure whether this is a compiler bug or a bug in kissnet, but I do recommend to just drop the operator bool() entirely.