single instance log & add global broadcast

doric-Qt/example/doric/utils/DoricGlobalBroadcast.h

@@ -0,0 +1,20 @@
+#ifndef DORICGLOBALBROADCAST_H
+#define DORICGLOBALBROADCAST_H
+
+#include <QDebug>
+
+class DoricGlobalBroadcast {
+private:
+  static DoricGlobalBroadcast *local_instance;
+  DoricGlobalBroadcast() { qDebug() << "DoricGlobalBroadcast constructor"; }
+
+  ~DoricGlobalBroadcast() { qDebug() << "DoricGlobalBroadcast destructor"; }
+
+public:
+  static DoricGlobalBroadcast *getInstance() {
+    static DoricGlobalBroadcast instance;
+    return &instance;
+  }
+};
+
+#endif // DORICGLOBALBROADCAST_H