SignalConnection

Signal!() sig;
SignalConnection conn;
size_t cnt = 0;

void slot() { cnt++; }

// disconnecting using a disconnect() call
sig.socket.connect(conn, &slot);
sig.emit();
assert(cnt == 1);
conn.disconnect();
assert(!conn.connected);
sig.emit();
assert(cnt == 1);

// disconnecting by destroying/overwriting the connection object
sig.socket.connect(conn, &slot);
sig.emit();
assert(cnt == 2);
conn = SignalConnection.init;
assert(!conn.connected);
sig.emit();
assert(cnt == 2);

// disconnecting through the signal
sig.socket.connect(conn, &slot);
sig.emit();
assert(cnt == 3);
sig.disconnectAll();
assert(!conn.connected);
sig.emit();
assert(cnt == 3);

// disconnecting by destroying the signal
sig.socket.connect(conn, &slot);
sig.emit();
assert(cnt == 4);
destroy(sig);
assert(!conn.connected);
sig.emit();
assert(cnt == 4);