Qt slots with return values

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Jun 29, 2013 ... What changes if we emit the object by value or receive it by value? ... The Qt documentation doesn't say a word about it. ... class that we will pass by const reference or by value to signals and slots. .... because receiveConstRef returns before the Copy object goes out of scope at the end of sendConstRef .

Qt Remote Objects 5.12.3 One of the key features of Qt to enable this is the distinction between an object's API (defined by its properties, signals and slots) and the implementation of that API. QEventLoop Class | Qt Core 5.12.2 From within the event loop, calling exit() will force exec() to return.

Boost.Signals позволяет различные стратегии используя возвращаемые значения слотов для формирования возвращаемого значения сигнала. Например. добавляя их, формируя из них vector или возвращая последний. Общая мудрость (выраженная в документации Qt...

Passing extra arguments to Qt slots - Eli Bendersky's website A few months ago I wrote about passing extra arguments to slots in PyQt.Here, I want to briefly discuss how the same effect can be achieved with Qt itself. C++ is not as dynamic as Python, so Python's approaches of using lambda or functools.partial won't work . Messaging and Signaling in C++ - meetingcpp.com

Qt Signal Slot Multithread, Protected, Public, or Private Signals. ... int value() const { return m_value; } void setValue(int value); private:See qabstractitemmodel.h ...

What you are seeing is undefined behaviour. Signals are not designed to give you the slots' return values, and there is no guarantee that your example will behave the same way in future versions of Qt. Make sure your code never tries to get the return value of a slot through a signal.

QGlib - GStreamer

Using C++11 Lambdas As Qt Slots – asmaloney.com Mar 13, 2016 ... I still work on it, keeping up-to-date with Qt and C++ as much as possible, and .... The one we'll use here is [=] which says to capture all variables from the local scope by value. ... We leave out the return type so void is inferred.