From 58720e1dc98186e79ef4e758a851b58df562f7b4 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 27 Aug 2021 04:05:33 +0300 Subject: libcamera: base: signal: Support connecting signals to functors It can be useful to connect a signal to a functor, and in particular a lambda function, while still operating in the context of a receiver object (to support both object-based disconnection and queued connections to Object instances). Add a BoundMethodFunctor class to bind a functor, and a corresponding Signal::connect() function. There is no corresponding disconnect() function, as a lambda passed to connect() can't be later passed to disconnect(). Disconnection typically uses disconnect(T *object), which will cover the vast majority of use cases. Signed-off-by: Laurent Pinchart Reviewed-by: Umang Jain --- test/signal.cpp | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) (limited to 'test') diff --git a/test/signal.cpp b/test/signal.cpp index 595782a2..fcf2def1 100644 --- a/test/signal.cpp +++ b/test/signal.cpp @@ -191,6 +191,24 @@ protected: signalVoid_.connect(slotStaticReturn); signalVoid_.connect(this, &SignalTest::slotReturn); + /* Test signal connection to a lambda. */ + int value = 0; + signalInt_.connect(this, [&](int v) { value = v; }); + signalInt_.emit(42); + + if (value != 42) { + cout << "Signal connection to lambda failed" << endl; + return TestFail; + } + + signalInt_.disconnect(this); + signalInt_.emit(0); + + if (value != 42) { + cout << "Signal disconnection from lambda failed" << endl; + return TestFail; + } + /* ----------------- Signal -> Object tests ----------------- */ /* @@ -256,6 +274,27 @@ protected: delete slotObject; + /* Test signal connection to a lambda. */ + slotObject = new SlotObject(); + value = 0; + signalInt_.connect(slotObject, [&](int v) { value = v; }); + signalInt_.emit(42); + + if (value != 42) { + cout << "Signal connection to Object lambda failed" << endl; + return TestFail; + } + + signalInt_.disconnect(slotObject); + signalInt_.emit(0); + + if (value != 42) { + cout << "Signal disconnection from Object lambda failed" << endl; + return TestFail; + } + + delete slotObject; + /* --------- Signal -> Object (multiple inheritance) -------- */ /* -- cgit v1.2.1