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Is it possible to see definition of Q_SIGNALS, Q_SLOT, SLOT(), SIGNAL() macros in Qt framework?
P.S. Google gave me nothing in this question.
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In Qt, we have an alternative to the callback technique: We use signals and slots. A signal is emitted when a particular event occurs. Qt's widgets have many predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal.
This ensures that truly independent components can be created with Qt. You can connect as many signals as you want to a single slot, and a signal can be connected to as many slots as you need. It is even possible to connect a signal directly to another signal.
Form qobjectdefs.h, for a non-debug compilation:
#define Q_SLOTS
#define Q_SIGNALS protected
#define SLOT(a) "1"#a
#define SIGNAL(a) "2"#a
The Q_SLOTS and Q_SIGNALS declarations are only treated specially by the moc run, in the final compilation they reduce to simple method declarations. SIGNAL() and SLOT() create names from the provided signatures.
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