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/cgtop/cgtop.c b/src/cgtop/cgtop.c
index 509fe4cdc8..ab8c4cfda1 100644
--- a/src/cgtop/cgtop.c
+++ b/src/cgtop/cgtop.c
@@ -695,8 +695,8 @@ int main(int argc, char *argv[]) {
         if (r <= 0)
                 goto finish;
 
-        a = hashmap_new(string_hash_func, string_compare_func);
-        b = hashmap_new(string_hash_func, string_compare_func);
+        a = hashmap_new(&string_hash_ops);
+        b = hashmap_new(&string_hash_ops);
         if (!a || !b) {
                 r = log_oom();
                 goto finish;