🔥 Nailing 13 signal and slot mistakes with clazy - KDAB

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Today I want to share 13 mistakes regarding signals, slots and connect statements How to use static analysis to improve performance · Uncovering 32 Qt Best.


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Warns when overriding signals in derived classes. Warns when a lambda inside a connect captures local variables by reference. Finds usages of Qt::UniqueConnection where the receiver is a functor , lambda or global function. To make it worse, Qt even allows you to override a signal with a non-signal , and vice-versa. Warns when auto-connection slots are used. These types of connections are very brittle, as a simple object rename would break your code. I just stumbled over one of these cases in Qt Creator code. Having signals non-const mean that no const method can emit a signal. This aims to prevent unintentionally marking a getter as slot, or connecting to the wrong method. This check warns when a signal is virtual. Sometimes we have classes are not in a class hierarchy, but have the same slot. Use void mySlot int instead of void mySlot const int [-Wclazy-connect-not-normalized] o. Do you intend to support Verdigris? As stated by the Qt documentation , this connect overload does not support Qt::UniqueConnection. This usually results in a crash as the lambda might get called after the captured variable went out of scope. The information you share with us will only be used for the purpose originally intended. Leave a Reply Cancel reply.{/INSERTKEYS}{/PARAGRAPH} For completeness a few older checks are also included, as they belong to this topic. APIs with overridden signals are hard to use, unexpected and bug-prone. I would rather argue that all signals should be const. Virtual signals make it very hard to read connect statements since they are unexpected. Warns when using the 3 argument connect that takes a lambda. For example connecting two slots together:. Yes, sign me up for the KDAB newsletter. In Qt 5 the pointer-to-member-function connect syntax is prefered as it catches errors at compile-time. Which clazy version will be included in Qt creator 4. {PARAGRAPH}{INSERTKEYS}Thanks for your interest in KDAB. The Qt 5 pointer-to-member syntax allows you to catch errors at compile-time rather than runtime. This check warns when connecting a non- signal to something. Also const methods emitting signals is also useful, e. With clazy your compiler will get Qt semantics and complain about this mistake. I only found 1. Conversely, you should not use those macros when calling something other than a signal. You can read more about it in our previous blog posts: How to use static analysis to improve performance Uncovering 32 Qt Best Practices Clazy 1. To avoid this, just pass a context object as 3rd argument:. First point still worth making though. A fixit is included for automatically rewriting your connects to the new form. The signals themselves do not change state, and there are situations where you want to send signals from methods that do not change state either, so in that case the signal must be const. Neither changes the state of the objects in question. Gunnar Roth Two remarks: 1. Conclusion Qt, or more specifically, moc, is very permissive in what it allows, either due to technical limitations, or simply the requirement to maintain source compatibility. I have to agree about the signals and const. Number 10 is wrong for signals. I have read and agree to the terms in the Privacy Policy. For slots it depends on the situation as there are valid cases for slots to be const, e. Qt, or more specifically, moc, is very permissive in what it allows, either due to technical limitations, or simply the requirement to maintain source compatibility. Nailing 13 signal and slot mistakes with clazy 1. Warns for any slot present in QThread derived classes. So what is a correct solution here? Then you can only use the old-style connect, but we get warnings everywhere. Clazy is a compiler plugin which generates warnings related to Qt. Could you guys also update the Windows binary? Tim Angus Is there a magic comment format to disable warnings on particular lines? Your email address will not be published. You can read more about it in our previous blog posts:. Using normalized signatures prevents unneeded memory allocations. How can Qt make simpler the authoring of common properties shared amongst a set of object? The best practice is usually to use worker objects , as illustrated here. Michael Vlach Eike Ziller Markus Has clazy 1. AIUI, a lambda connect is a Qt::DirectConnection, whereas a connect with a receiver is, by default, a Qt::AutoConnection meaning that simply adding a receiver potentially changes the connection type. See QMetaObject::normalizedSignature for more information. Today I want to share 13 mistakes regarding signals , slots and connect statements and how to find them at compile time with clazy , our open-source static-analyzer for Qt.