Qt slot function return value

Note that you can trigger slots and get a return value. Look into the [[Doc:QMetaObject]] docs for details. OK, that is not the same as just emitting a signal and catch the return value (or, of course, values, if the signal was connected to multiple slots), but it may be useful nonetheless.

Jan 25, 2017 ... We can use this lambda in a function like std::transform() to ... for(int value : vect) { std::cout << value << std::endl; } return 0; } .... public slots: What do I do if a slot is not invoked? - KDAB Mar 9, 2017 ... we can test the return value (for instance, by adding an assertion), or ... Qt automatically breaks a signal/slot connection if either the sender or the ... that signals are ordinary member functions) or a lambda connected to it, can ... Crash course in Qt for C++ developers, Part 3 / Clean Qt

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QML2 to C++ and back again, with signals and slots - andrew-jones.com 23 Nov 2014 ... Signals and Slots are a feature of Qt used for communication ... the GUI with a progress bar, then kick off a function to handle this input. ... I will emit the signal when the button is pressed, passing the value of the text field. Type-safe Signals and Slots in C++: Part 2 - CodeProject to return the sum of the return values of all callback functions that have been .... Boost and QT also offer signal / slot functionality (see Part 1 of the article series).

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c++ - Qt: meaning of slot return value? - Stack Overflow Looking through the Qt source it seems that when a slot is called from QMetaObject::invokeMethod the return type can be specified and the return value obtained. (Have a look at invokeMethod in the Qt help) I could not find many examples of this actually being used in the Qt source. One I found was. Getting a return value from an emitted signal | Qt Forum Getting a return value from an emitted signal. Qt::DirectConnection 1 The slot is invoked immediately, when the signal is emitted. So I thought I could do something like i wrote above. If I well understood so the problem is that I cannot make any assumptions on if the return statement of the slot …

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May 7, 2015 ... For more detailed information, see Signals & Slots on the Qt website. .... The connect() function returns a Boolean value that indicates whether ... QML2 to C++ and back again, with signals and slots - andrew-jones.com Nov 23, 2014 ... Signals and Slots are a feature of Qt used for communication ... the GUI with a progress bar, then kick off a function to handle this input. ... I will emit the signal when the button is pressed, passing the value of the text field. Qt Internals & Reversing - NTCore