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    Upvotes11Top Answeredited Jun 20, 2020 at 9:12

    Is there any difference?

    There is no difference other than the external bracket being needless, so programmers will prefer that, and it is also more conventionally used in Qt projects out there.

    The reason for the no difference is due to this:

    # define emit

    You can see the definition of this in the source code.

    Therefore, it is basically just declared to an "empty" string and preprocessor will replace your variants to:

    someSignal(value);

    or

    (someSignal(value));

    You could see this yourself if, for a quick test, you stop the execution of the compiler afte...

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  3. Stack Overflow
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    What is emit in JavaScript?The emit keyword is optional and is simply a macro which expands to nothing. The following four versions are all the same when written in a member function of the same class which contains the signal: emit this->signalLogAppend ("foo"); emit signalLogAppend ("foo"); this->signalLogAppend ("foo"); signalLogAppend ("foo");

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    Is emit a macro?No, emit is indeed only a empty macro and purely optional. Not so are the keywords signal and slot which are processed by the moc. signal is used to provide the implementation of the function, slot is used to create the meta object entry so it is found with the SLOT(MySlot()) macro or in QML. emit is syntactic suggar.

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    What does emit mean in Qt?As @JonB told you, emit has no meaning, you can remove it without trouble. This is only a "syntactic sugar" to help you on code reading to known that you are using a signal. Signals/slots are very important in Qt, you have to know how they work to be able to right develop with Qt.

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    What is the difference between Emit and just?In fact, emit is defined as an empty macro, so just is also equivalent. The emit just makes it more obvious you're triggering a Qt signal. There is absolutely no difference. It's an empty preprocessor definition and thus gets removed before the compiler gets to see the code. As far as the compiler's concerned, it doesn't even exist.

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