Conversion between glib data structures

[Morten Welinder <terra diku dk>]

While Gnumeric-hacking, I quite often find it necessary to convert
from one glib data structure to another.  Glib has no provisions
for that, it seems.

Typically, things have been built and maintained as a hash for
speed, but is needed as a list in the end.  This can certainly
be done with the current method of _foreach, but it's cumbersome
and quite inelegant in C.

Would it be acceptable to add a bunch of functions to glib?
Specifically...

GSList *g_hash_table_to_slist (GHash *h, gboolean keys, gboolean values);
GList *g_hash_table_to_list (GHash *h, gboolean keys, gboolean values);
GPtrArray *g_hash_table_to_ptrarray (GHash *h, gboolean keys, gboolean values);

And possibly, for naming convenience:

#define g_hash_table_domain_slist(h) \
  g_hash_table_to_slist (h, TRUE, FALSE)
#define g_hash_table_range_slist(h) \
  g_hash_table_to_slist (h, FALSE, TRUE)

etc.

These should probably be placed in a file of their own, to avoid tying
the .o files together with inter-file references.

Comments?

Morten
(cc, please -- not on list)