πŸ”₯ What is Q_OBJECT macro and what is the need of it? | Qt Forum

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class MyClass: public QObject { Q_OBJECT public: MyClass(QObject *parent = 0​); ~MyClass(); signals: void mySignal(); public slots: void mySlot(); };.


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The Q_OBJECT macro is used to enable meta-object features when declared within a class definition. The Meta-Object Compiler (moc) will read the class.


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However, if I remember correctly the Qt moc gets confused if we add the Q_OBJECT macro without pulling out the class into a separate file.


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Q_OBJECT requires the class to be subclass of QObject. This macro is necessary for the class to declare its signals/slots and to use Qt meta-object system. If Meta.


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Meta Object System is a part of Qt framework core provided to support Qt extensions to C++ like signals/slots for inter-object communication, run-time type information, and the dynamic property system.


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From the Qt documentation: The Meta-Object Compiler, moc, is the program that handles Qt's C++ extensions. The moc tool reads a C++.


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Meta Object System is a part of Qt framework core provided to support Qt extensions to C++ like signals/slots for inter-object communication, run-time type information, and the dynamic property system.


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The Q_OBJECT macro is used to enable meta-object features when declared within a class definition. The Meta-Object Compiler (moc) will read the class.


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, #define Q_OBJECT_FAKE Q_OBJECT QT_ANNOTATE_CLASS(qt_fake, "")​. , #ifndef QT_NO_META_MACROS. , /* qmake ignore Q_GADGET.


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, #define Q_OBJECT_FAKE Q_OBJECT QT_ANNOTATE_CLASS(qt_fake, "")​. , #ifndef QT_NO_META_MACROS. , /* qmake ignore Q_GADGET.


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This generated source file is either include'd into the class's source file or, more usually, compiled and linked with the class's implementation. Related Hot Network Questions. Active 8 months ago. Be aware, this might be platform dependent and it might change depending on the version of QT. Feedback post: New moderator reinstatement and appeal process revisions. It also pollutes your class's namespace with QObject -specific members. Question feed. Learn more. Linked 1. That's wrong. Stack Overflow works best with JavaScript enabled.{/INSERTKEYS}{/PARAGRAPH} Featured on Meta. ApproachingDarknessFish Bob Zhang Bob Zhang 53 1 1 silver badge 4 4 bronze badges. Sign up using Facebook. The Overflow Blog. Asked 10 years, 10 months ago. Viewed 73k times. Arne Arne 6, 4 4 gold badges 37 37 silver badges 57 57 bronze badges. New post lock available on meta sites: Policy Lock. Sign up using Email and Password. But it will be quietly ignored in any other classes - it just adds to the build time. What is the purpose of this preprocessor macro? Among other things, meta-object code is required for the signals and slots mechanism, the run-time type information, and the dynamic property system. You can see it is not just a tag for the moc compiler. See more linked questions. Post as a guest Name. The macro is useful, but neither limited to nor required for gui-classes. How Stack Overflow hires engineers. So whether the macro should appear in under the private , protected , or public specifiers is irrelevant β€” it's just convention to place it at the head of the class. Email Required, but never shown. Sign up or log in Sign up using Google. Stu Mackellar Stu Mackellar Martin Beckett Martin Beckett It can lead to some perplexing behavior, so it's a bad idea. Andres Andres 17 3 3 bronze badges. In gcc with -E you can see expanded macros. Upcoming Events. Why do all Qt objects need this macro? {PARAGRAPH}{INSERTKEYS}Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Reinstate Monica Active Oldest Votes. Ask Question. Your code will be subtly broken when the macro is absent, and just because it happens to compile doesn't make it OK.