12/24/2023 0 Comments Qt creator remove signal slot![]() The class – let’s call it Copy – looks as follows. ![]() Setting the Stageįor our experiments, we need a copyable class that we will pass by const reference or by value to signals and slots. ![]() So, let’s have a systematic and detailed look at how arguments are passed to signals and slots. There is a good discussion on stackoverflow, which unfortunately leaves it to the reader to pick the right answer from all the answers and comments. The Qt documentation doesn’t say a word about it. Nearly every customer asks this question at some point in a project. How often is a an object copied, if it is emitted by a signal as a const reference and received by a slot as a const reference? How does the behaviour differ for direct and queued signal-slot connections? What changes if we emit the object by value or receive it by value?
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