diff --git a/cpp/ui/ncurses/hw/hwcurses.cpp b/cpp/ui/ncurses/hw/hwcurses.cpp
index 3bf43e3..a0a3981 100644
--- a/cpp/ui/ncurses/hw/hwcurses.cpp
+++ b/cpp/ui/ncurses/hw/hwcurses.cpp
@@ -1,3 +1,4 @@
+#include "timer.hpp"
 #include <algorithm>
 #include <chrono>
 #include <clocale>
@@ -10,7 +11,7 @@
 #include <string>
 #include <thread>
 #include <unistd.h>
-#include "timer.hpp"
+#include <utility>
 #include <vector>
 
 /*
@@ -24,15 +25,32 @@
 
 void myupdatedisplay(const timer &timer_input) {
   int x_offset = COLS / 4;
-  mvprintw(timer_input.triggercounter, timer_input.triggercounter+x_offset, "test: █");
+  mvprintw(timer_input.triggercounter, timer_input.triggercounter + x_offset,
+           "test: █");
 }
 
+std::vector<int> mynumbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+
+void swapnumbers(std::vector<int> &input_numbers) {
+  for (size_t i = 0; i < input_numbers.size() / 2; ++i) {
+    int temp = input_numbers[i];
+    input_numbers[i] = input_numbers[input_numbers.size() -1 - i];
+    input_numbers[input_numbers.size() -1 - i] = temp;
+  }
+}
+
+void displaynumbers(int myy, std::vector<int> &input_numbers){
+  for (size_t i = 0; i < input_numbers.size(); i++) {
+    mvprintw(myy, 10+i, "%d,", input_numbers[i]);
+  }
+  }
+
 void createbalk(const timer &timer_input, cchar_t &input_char) {
   int ticnt = timer_input.triggercounter;
-    mvwvline_set(stdscr, LINES-ticnt, ticnt, &input_char, ticnt);  
+  mvwvline_set(stdscr, LINES - ticnt, ticnt, &input_char, ticnt);
 }
 
-int main() {
+void myinitialize(){
   setlocale(LC_ALL, "");
   initscr();
   nodelay(stdscr, FALSE);
@@ -41,16 +59,24 @@ int main() {
   init_pair(1, COLOR_BLUE, COLOR_WHITE);
   attron(COLOR_PAIR(1));
   printw("Hello World! 🌍 テスト 测试");
+  }
+
+int main() {
+  myinitialize();
   const wchar_t mywch = L'█';
   cchar_t myc_char;
   setcchar(&myc_char, &mywch, A_NORMAL, 0, NULL);
   // printf("verification\n");
-
   auto starttime = std::chrono::steady_clock::now(); // initial starttime
-  auto clocktimer = std::make_unique<timer>("secondsprinter", 1, 10, [&myc_char](const timer& t){createbalk(t,myc_char);});
-  timermanager mytimermanager;  
+  
+  auto myaction = std::make_unique<swapaction>(mynumbers);
+  auto clocktimer = std::make_unique<timer>(
+      "secondsprinter", 1, 10,
+      std::move(myaction));
+  timermanager mytimermanager;
   mytimermanager.addtimer(std::move(clocktimer));
-
+  //swapnumbers(mynumbers);
+  displaynumbers(2,mynumbers);
   mvprintw(5, 5, "timer added");
   // calculate delta between current and previous time
   while (true) {
@@ -58,7 +84,7 @@ int main() {
     std::chrono::duration<double> myDeltaTime = currenttime - starttime;
     double dtime = myDeltaTime.count();
     mytimermanager.updatetimers(dtime);
-
+	displaynumbers(3,mynumbers);
     starttime = currenttime;
     std::this_thread::sleep_for(std::chrono::milliseconds(500));
   }
diff --git a/cpp/ui/ncurses/hw/timer.cpp b/cpp/ui/ncurses/hw/timer.cpp
index df57a4a..ec95a54 100644
--- a/cpp/ui/ncurses/hw/timer.cpp
+++ b/cpp/ui/ncurses/hw/timer.cpp
@@ -6,25 +6,26 @@
 #include <memory>
 #include <ncurses.h>
 #include <string>
+#include <vector>
 
 // infinite timer
 timer::timer(std::string name_input, size_t interval_input,
-             std::function<void(const timer &)> callback_input)
+             std::unique_ptr<timeraction> action_input)
     : time_interval(interval_input), name(name_input), is_infinite(true),
-      callbackfunc(callback_input) {}
+      action(std::move(action_input)) {}
 
 // limited timer
 timer::timer(std::string name, size_t interval_input, int triggeramount,
-             std::function<void(const timer &)> callback)
+             std::unique_ptr<timeraction> action_input)
     : triggeramount(triggeramount), time_interval(interval_input), name(name),
-      callbackfunc(callback) {}
+      action(std::move(action_input)) {}
 
 // callbackfunc once enough time has accumulated
 void timer::updatetime(double DeltaTime) {
   accumulator += DeltaTime;
   if (!is_expired) {
     if (accumulator >= time_interval) {
-      callbackfunc(*this);
+      action->update(*this);
       accumulator -= time_interval;
       triggercounter++;
       if (!is_infinite && triggercounter >= triggeramount) {
@@ -49,3 +50,15 @@ void timermanager::updatetimers(double dtime) {
   // implement delete timers
   refresh();
 }
+
+swapaction::swapaction(std::vector<int> &input_vector): input_vector(input_vector){}
+
+void swapaction::update(const timer &input_timer){
+  if (!iscomplete) {
+	int temp = input_vector[it_i];
+    input_vector[it_i] = input_vector[input_vector.size() -1 - it_i];
+    input_vector[input_vector.size() - 1 - it_i] = temp;
+    it_i++;
+    if(it_i>=input_vector.size() / 2){iscomplete=true;}
+  }
+}
diff --git a/cpp/ui/ncurses/hw/timer.hpp b/cpp/ui/ncurses/hw/timer.hpp
index 5de549e..8ca93a5 100644
--- a/cpp/ui/ncurses/hw/timer.hpp
+++ b/cpp/ui/ncurses/hw/timer.hpp
@@ -8,7 +8,13 @@
 #include <string>
 #include <vector>
 
+class timer;
 
+class timeraction {
+public:
+  virtual ~timeraction() = default;
+  virtual void update(const timer &t) = 0;
+};
 
 class timer {
 private:
@@ -21,18 +27,19 @@ public:
   std::string name;
   int triggercounter = 0;
   bool is_infinite = false;
-  std::function<void(const timer&)> callbackfunc;
+  std::unique_ptr<timeraction> action;
   bool is_expired = false;
 
 
   //infinite timer
   timer(std::string name_input, size_t interval_input,
-        std::function<void(const timer &)> callback_input);
+		std::unique_ptr<timeraction> action_input        
+        );
   
   //limited timer
   timer(std::string name, size_t interval_input, int triggeramount,
-        std::function<void(const timer &)> callback);
-
+        std::unique_ptr<timeraction> action
+        );
   // callbackfunc once enough time has accumulated
   void updatetime(double DeltaTime);
 };
@@ -47,4 +54,19 @@ public:
   void updatetimers(double dtime);
 };
 
-#endif    
+class swapaction : public timeraction {
+public:  
+  size_t it_i = 0;
+  bool iscomplete = false;
+  std::vector<int> &input_vector;
+  swapaction(std::vector<int> &input_vector);
+  void update(const timer &t);
+};
+
+
+#endif
+
+
+/*
+externalize state
+*/