The type used for callback functions in structure definitions and function
signatures.
This doesn't mean that all callback functions must take no parameters and
return void. The required signature of a callback function is determined by
the context in which is used (e.g. the signal to which it is connected).
Use G_CALLBACK() to cast the callback function to a #GCallback.
The type used for callback functions in structure definitions and function signatures.
This doesn't mean that all callback functions must take no parameters and return void. The required signature of a callback function is determined by the context in which is used (e.g. the signal to which it is connected).
Use G_CALLBACK() to cast the callback function to a #GCallback.