fix crash when changing toolbar visibility with empty toolbar.tools

1 files changed, 1 insertions, 1 deletions

diff --git a/src/FbTk/Subject.cc b/src/FbTk/Subject.cc
index 2b30fd8..08a211c 100644
--- a/src/FbTk/Subject.cc
+++ b/src/FbTk/Subject.cc
@@ -64,7 +64,7 @@ void Subject::notify() {
     m_notify_mode = false;
 
     // remove dead observers
-    if (m_dead_observers.size()) {
+    if (!m_dead_observers.empty()) {
         std::for_each(m_dead_observers.begin(),
                       m_dead_observers.end(),
                       std::bind1st(std::mem_fun(&Subject::detach), this));