hashmap: introduce hash_ops to make struct Hashmap smaller

It is redundant to store 'hash' and 'compare' function pointers in
struct Hashmap separately. The functions always comprise a pair.
Store a single pointer to struct hash_ops instead.

systemd keeps hundreds of hashmaps, so this saves a little bit of
memory.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/resolve/resolved-dns-domain.h b/src/resolve/resolved-dns-domain.h
index e674c5d9c5..0888a7846f 100644
--- a/src/resolve/resolved-dns-domain.h
+++ b/src/resolve/resolved-dns-domain.h
@@ -37,6 +37,7 @@ int dns_name_normalize(const char *s, char **_ret);
 
 unsigned long dns_name_hash_func(const void *s, const uint8_t hash_key[HASH_KEY_SIZE]);
 int dns_name_compare_func(const void *a, const void *b);
+extern const struct hash_ops dns_name_hash_ops;
 
 int dns_name_equal(const char *x, const char *y);
 int dns_name_endswith(const char *name, const char *suffix);