Determines the next item type of a tuple or dictionary entry
type.
@type must be the result of a previous call to
g_variant_type_first() or g_variant_type_next().
If called on the key type of a dictionary entry then this call
returns the value type. If called on the value type of a dictionary
entry then this call returns %NULL.
For tuples, %NULL is returned when @type is the last item in a tuple.
Determines the next item type of a tuple or dictionary entry type.
@type must be the result of a previous call to g_variant_type_first() or g_variant_type_next().
If called on the key type of a dictionary entry then this call returns the value type. If called on the value type of a dictionary entry then this call returns %NULL.
For tuples, %NULL is returned when @type is the last item in a tuple.