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, 5 insertions, 0 deletions

diff --git a/src/resolve/resolved-dns-domain.c b/src/resolve/resolved-dns-domain.c
index 8ed1ecf0a4..e1eb3ddfe5 100644
--- a/src/resolve/resolved-dns-domain.c
+++ b/src/resolve/resolved-dns-domain.c
@@ -371,6 +371,11 @@ int dns_name_compare_func(const void *a, const void *b) {
         }
 }
 
+const struct hash_ops dns_name_hash_ops = {
+        .hash = dns_name_hash_func,
+        .compare = dns_name_compare_func
+};
+
 int dns_name_equal(const char *x, const char *y) {
         int r, q, k, w;