mds/CDir.cc: use !empty() instead of size()

Use empty() since it should be prefered as it has, following the
standard, a constant time complexity regardless of the containter
type. The same is not guaranteed for size().

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

diff --git a/src/mds/CDir.cc b/src/mds/CDir.cc
index 22cdf48b5af08b6bb630d65d39c73ae90c8f8c00..a1ed05cea263d6c213e7fb951abca5e016245984 100644 (file)
--- a/src/mds/CDir.cc
+++ b/src/mds/CDir.cc
@@ -1175,7 +1175,7 @@ void CDir::add_waiter(uint64_t tag, Context *c)
 /* NOTE: this checks dentry waiters too */
 void CDir::take_waiting(uint64_t mask, list<Context*>& ls)
 {
-  if ((mask & WAIT_DENTRY) && waiting_on_dentry.size()) {
+  if ((mask & WAIT_DENTRY) && !waiting_on_dentry.empty()) {
     // take all dentry waiters
     while (!waiting_on_dentry.empty()) {
       map<string_snap_t, list<Context*> >::iterator p = waiting_on_dentry.begin();