Qt signal slot with return value

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GitHub - robertknight/qt-signal-tools: Utility classes related to Qt signal ...

Getting a return value from an emitted signal | Qt Forum I read in the documentation Qt::DirectConnection 1 The slot is invoked immediately, when the signal is emitted. So I thought I could do ... How Qt Signals and Slots Work - Woboq 2 Dec 2012 ... Qt is well known for its signals and slots mechanism. ... { return m_value; } public slots: void setValue(int value ); signals: void valueChanged(int ... How Qt Signals and Slots Work - Part 3 - Queued and Inter Thread ... 4 Feb 2016 ... Once the signal returns, they will not be valid anymore. So we'll have to copy the parameter values of the function on the heap. In order to do ... How C++ lambda expressions can improve your Qt code - Medium

c++ - How can I return a value from SLOT in Qt5? - Stack ...

the vector _a is a list of arguments that is passed to qt_metacall. This is passed by QMetaObject::invokeMethod. So the return value in the moc generated code is saved and passed back to the caller. So for normal signal-slot interactions the return value is not Slot return value - what if it would be not lost? | Qt Forum The very fact that a return value or something like that is required for proper operation, means that signal/slot is not the right approach for Gourmand. He would probably be better off using invokeMethod() as you state or just call the function he How can I return a value from SLOT in Qt5? - Stack Overflow

I'm running all my SQLite database operations in a separate thread to ensure that the GUI wont freeze up. I'm doing this by connecting up signals and slots for the methods.

13 Feb 2012 ... Debugging Qt's signal-slot connections… What do ... If need be, ensure that connect succeeds by testing its return value (it should return true . Qt 5 and C++11: Lambdas Are Your Friend | Custom Software ... 12 Sep 2013 ... Since Qt 5 was released I had been putting off upgrading to Qt 5 on a project I have ... SIGNAL and SLOT used in the connect method calls are macros that ... used in the body by value) connect(pushButton, &QPushButton::clicked, .... and performs functions such as recognizing you when you return to our ... coding style - Is it good practice to have your C++/Qt functions ...

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How Qt Signals and Slots Work - Part 3 - Queued and Inter Thread ... Feb 4, 2016 ... Once the signal returns, they will not be valid anymore. So we'll have to copy the parameter values of the function on the heap. In order to do ...