Initializes an iterator for @set and points it to the first value in @set.
If @set is empty, %FALSE is returned and @value is set to %G_MAXUINT.
a pointer to an uninitialized GtkBitsetIter
a GtkBitset
Set to the first value in @set
%TRUE if @set isn't empty.
See Implementation
Initializes an iterator for @set and points it to the first value in @set.
If @set is empty, %FALSE is returned and @value is set to %G_MAXUINT.