serialize: add serialize_bool_elide() helper

In many case we serialize into objects that have been zero-initialized.
To save some time and resources when there are a lot of booleans, add a
helper that serializes only when the boolean is true.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/shared/serialize.h b/src/shared/serialize.h
index 8fdc6dc304..8b6e0999f1 100644
--- a/src/shared/serialize.h
+++ b/src/shared/serialize.h
@@ -19,6 +19,9 @@ int serialize_strv(FILE *f, const char *key, char **l);
 static inline int serialize_bool(FILE *f, const char *key, bool b) {
         return serialize_item(f, key, yes_no(b));
 }
+static inline int serialize_bool_elide(FILE *f, const char *key, bool b) {
+        return b ? serialize_item(f, key, yes_no(b)) : 0;
+}
 
 int deserialize_usec(const char *value, usec_t *timestamp);
 int deserialize_dual_timestamp(const char *value, dual_timestamp *t);