Fixing the clock signal to use GLib::Dispatcher to emit the signal so the main thread updates the clockLabel widget

src/minefield.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <atomic>
 #include <sigc++/signal.h>
 #include <utility>
 #include <vector>
@@ -26,8 +27,8 @@ class MineField {
   int    m_openCells;
   bool   m_exploded;
   bool   m_gameWon;
-  bool   m_timerRunning;
   size_t m_time;
+  std::atomic_bool m_timerRunning;
   std::thread m_timerThread;
   void computeBombsNearby(int x, int y);
   void openNeighboorhood(int x, int y);
@@ -38,6 +39,7 @@ class MineField {
   
 public:
   MineField(int cols, int rows, int mines);
+  ~MineField();
   void initBombs(int x, int y);
   bool isBomb(int x, int y);
   bool isFlagged(int x, int y);
@@ -49,6 +51,7 @@ public:
   int  getRows() {return m_rows; };
   bool toggleFlag(int x, int y);
   int  getRemainingFlags() {return m_remainingFlags; };
+  size_t getCurrentTime() {return m_time; };
   int  getTotalMines() {return m_totalMines; };
   void startNewGame(int cols, int rows, int mines);