add more files msgs

nav_msgs/include/nav_msgs/GridCells.h

@@ -21,8 +21,27 @@ struct GridCells
     float cell_width;
     float cell_height;
     std::vector<geometry_msgs::Point> cells;
+    
+    GridCells() = default;
 };
 
+inline bool operator==(const nav_msgs::GridCells & lhs, const nav_msgs::GridCells & rhs)
+{
+    if(lhs.cells.size() != rhs.cells.size()) return false;
+    for(int i = 0; i < lhs.cells.size(); i++)
+    {
+        if(lhs.cells[i] != rhs.cells[i]) return false;
+    }
+  return lhs.header == rhs.header &&
+    isEqual(lhs.cell_width, rhs.cell_width) &&
+    isEqual(lhs.cell_height, rhs.cell_height);
+}
+
+inline bool operator!=(const nav_msgs::GridCells & lhs, const nav_msgs::GridCells & rhs)
+{
+  return !(lhs == rhs);
+}
+
 }
 
 #endif //GRID_CELLS_H