WiFiClient::operator bool() always returns true

[bigtiger0905]

when server.available() returns WiFiClient(-1). _sock variable will be 255.

and 255 >= 0 always returns true

[M-ichae-l]

Yes.
“return _sock >=0;” is to check is there is a sock.

[bigtiger0905]

but if there is no connection. it still returns true. because uint8_t (uint8_t _sock) cannot be less than 0.