list_families

Description:

public virtual void list_families (out (unowned FontFamily)[] families)

List all families for a fontmap.

Note that the returned families are not in any particular order.

`PangoFontMap` also implemented the [iface@Gio.ListModel] interface for enumerating families.

this	a `PangoFontMap`
families	location to store a pointer to an array of `PangoFontFamily` *. This array should be freed with g_free.
n_families	location to store the number of elements in `families`