remove UI objects when a task is deleted

app/task/taskmanager.cpp

@@ -30,6 +30,11 @@ TaskManager::TaskManager()
   maximum_task_count_ = QThread::idealThreadCount();
 }
 
+TaskManager::~TaskManager()
+{
+  Clear();
+}
+
 void TaskManager::AddTask(Task* t)
 {
   // Connect Task's status signal to the Callback
@@ -45,6 +50,17 @@ void TaskManager::AddTask(Task* t)
   StartNextWaiting();
 }
 
+void TaskManager::Clear()
+{
+  // TODO Cancelling tasks
+
+  // Delete Tasks from memory
+  for (int i=0;i<tasks_.size();i++) {
+    delete tasks_.at(i);
+  }
+  tasks_.clear();
+}
+
 void TaskManager::StartNextWaiting()
 {
   // Count the tasks that are currently active

app/task/taskmanager.h

@@ -42,6 +42,33 @@ public:
    */
   TaskManager();
 
+  /**
+   * @brief TaskManager Destructor
+   *
+   * Ensures all Tasks are deleted
+   */
+  virtual ~TaskManager();
+
+  /**
+   * @brief Deleted copy constructor
+   */
+  TaskManager(const TaskManager& other) = delete;
+
+  /**
+   * @brief Deleted move constructor
+   */
+  TaskManager(TaskManager&& other) = delete;
+
+  /**
+   * @brief Deleted copy assignment
+   */
+  TaskManager& operator=(const TaskManager& other) = delete;
+
+  /**
+   * @brief Deleted move assignment
+   */
+  TaskManager& operator=(TaskManager&& other) = delete;
+
   /**
    * @brief Add a new Task
    *
@@ -56,6 +83,11 @@ public:
    */
   void AddTask(Task *t);
 
+  /**
+   * @brief Forcibly
+   */
+  void Clear();
+
 signals:
   /**
    * @brief Signal emitted when a Task is added by AddTask()