q_slots - Signals & Slots | Qt Core | Qt 6.9.0 g2g slot 888

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The public API of Qt-based libraries should use the keywords Q_SIGNALS and Q_SLOTS instead of signals and slots. Otherwise it is hard to use such a library in a project that defines QT_NO_KEYWORDS.

Since display() is part of the class's interface with the rest of the program, the slot is public. ... The public API of Qt-based libraries should use the keywords Q_SIGNALS and Q_SLOTS instead of signals and slots.

Then to continue using Qt signals and slots with the no_keywords flag, simply replace all uses of the Qt moc keywords in your sources with the corresponding Qt macros Q_SIGNALS (or Q_SIGNAL), Q_SLOTS (or Q_SLOT), and Q_EMIT.