Реализация на абстрактен клас Task и конкретен клас QuickTask

tasks/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.7)
+project(tasks)
+file(GLOB SOURCES "*.cpp" "../common/named.cpp")
+set(CMAKE_BUILD_TYPE Debug)
+set(CMAKE_CXX_STANDARD 11)
+add_executable(tasks ${SOURCES})

tasks/main.cpp

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+#include <iostream>
+
+#include "quick_task.h"
+
+void testQuickTask() {
+  QuickTask qt("лицева опора");
+  qt.print();
+  qt.work(1);
+  std::cout << std::endl;
+  qt.print();
+}
+
+int main() {
+  testQuickTask();
+}

tasks/quick_task.cpp

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+#include "quick_task.h"
+
+void QuickTask::print(std::ostream& os) const {
+  os << "Бърза ";
+  Task::print(os);
+}
+
+QuickTask::QuickTask(char const* n) :
+  Task(n), finished(false) {}
+
+unsigned QuickTask::work(unsigned t) {
+  if (finished || t == 0)
+    return t;
+
+  finished = true;
+  return t - 1;
+}

tasks/quick_task.h

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+#include "task.h"
+
+class QuickTask : public Task {
+  bool finished;
+public:
+  QuickTask(char const* n);
+
+  unsigned getExecutionTime() const { return 1; }
+
+  unsigned getProgress() const { return finished; }
+
+  unsigned work(unsigned t);
+
+  void print(std::ostream& os = std::cout) const;
+};

tasks/task.cpp

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+#include "task.h"
+
+void Task::print(std::ostream& os) const {
+  os << "задача '" << getName() << "', която изисква "
+     << getExecutionTime() << " единици време"
+     << " и е с прогрес " << getProgress();
+}
+
+Task::Task(char const* n) : Named(n) {}

tasks/task.h

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+#ifndef __TASK_H
+#define __TASK_H
+
+#include "../common/printable.h"
+#include "../common/named.h"
+
+class Task : public Printable, public Named {
+
+public:
+
+  Task(char const* n);
+
+  // извежда собствените член-данни
+  void print(std::ostream& os = std::cout) const;
+
+  // време за изпълнение на задачата
+  virtual unsigned getExecutionTime() const = 0;
+
+  // прогрес по задачата
+  virtual unsigned getProgress() const = 0;
+
+  bool isFinished() const {
+    return getProgress() == getExecutionTime();
+  }
+
+  // отчита time единици работа по задачата
+  // връща броя неизползвани единици време
+  virtual unsigned work(unsigned time) = 0;
+
+
+};
+
+#endif