Remove useless code

examples/qc/qCDispatcher.cxx

@@ -9,9 +9,8 @@
 #include <fairmq/Device.h>
 #include <fairmq/runDevice.h>
 
-class QCDispatcher : public FairMQDevice
+struct QCDispatcher : fair::mq::Device
 {
-  public:
     QCDispatcher()
         : fDoQC(false)
     {
@@ -31,7 +30,6 @@ class QCDispatcher : public FairMQDevice
         });
     }
 
-  protected:
     bool HandleData(FairMQMessagePtr& msg, int)
     {
         if (fDoQC.load() == true) {

examples/qc/sampler.cxx

@@ -12,13 +12,9 @@
 #include <thread> // this_thread::sleep_for
 #include <chrono>
 
-class Sampler : public FairMQDevice
+struct Sampler : fair::mq::Device
 {
-  public:
-    Sampler() = default;
-
-  protected:
-    virtual bool ConditionalRun()
+    bool ConditionalRun() override
     {
         FairMQMessagePtr msg(NewMessage(1000));
 

examples/qc/sink.cxx

@@ -11,12 +11,9 @@
 
 #include <string>
 
-class Sink : public FairMQDevice
+struct Sink : fair::mq::Device
 {
-  public:
     Sink() { OnData("data2", &Sink::HandleData); }
-
-  protected:
     bool HandleData(FairMQMessagePtr& /*msg*/, int /*index*/) { return true; }
 };