I have a signal in my widget which currently have no handlers at all. This
signal returns a gboolean. When I call g_signal_emit() I give the address
to a boolean variable.
Here is the code where I emit:
gboolean b = TRUE;
g_print ("before: %s\n", b?"true":"false");
g_signal_emit (GTK_OBJECT (board),
signals[CAN_LIFT],
0,
SQUARE_COL(board,from),
SQUARE_ROW(board,from),
&b );
g_print ("after: %s\n", b?"true":"false");
When I have a signal handler it will set the variable b and everything is
nice.
But my question is what happens when you don't have a any handler?
People at irc and the code of gtk itself (for example in gtkwidget.c)
suggest that if you have no handler no-one will assign to the return
variable, and therefor if you set a default value before the emit it will
still be there after.
But this doesn't seem to happen. So either there is a bug in g_signal_emit
that always assigns the return value, or there is a bug in gtk where code
do assign to the variable before calling emit.
I have search the documentation to try to find out the intended behavior
but no luck.
I did look at g_signal_emit() and to me it looks like the return value is
always initialized, but there is too much code there that I'm not familiar
with.
There is of course also a third possibility that I do something stupid
somewhere, but I'll assume (for now) that it is not the case here ;-)
--
/Dennis
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