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, 2 insertions, 2 deletions

diff --git a/src/shared/set.h b/src/shared/set.h
index e0b9c9e0a8..e650b7e3fe 100644
--- a/src/shared/set.h
+++ b/src/shared/set.h
@@ -32,12 +32,12 @@
 
 typedef struct Set Set;
 
-Set *set_new(hash_func_t hash_func, compare_func_t compare_func);
+Set *set_new(const struct hash_ops *hash_ops);
 void set_free(Set* s);
 void set_free_free(Set *s);
 
 Set* set_copy(Set *s);
-int set_ensure_allocated(Set **s, hash_func_t hash_func, compare_func_t compare_func);
+int set_ensure_allocated(Set **s, const struct hash_ops *hash_ops);
 
 int set_put(Set *s, void *value);
 int set_consume(Set *s, void *value);