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In gnucash, I need to attach some SCM values (Guile level function pointers) as the data to GTK callback functions. So is it OK to do this: SCM setter_func; ... gtk_signal_connect (GTK_OBJECT (option_toggle), "toggled", (GtkSignalFunc) call_boolean_setter, (gpointer) setter_func); or do I need to do something safer like this: SCM setter_func; SCM *setter_func_ptr = malloc(sizeof(SCM)); *setter_func_ptr = setter_func; ... gtk_signal_connect (GTK_OBJECT (option_toggle), "toggled", (GtkSignalFunc) call_boolean_setter, (gpointer) setter_func_ptr); Thanks -- Rob Browning <rlb@cs.utexas.edu> PGP=E80E0D04F521A094 532B97F5D64E3930