New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/base/deferred_task.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "base/thread.hpp"
+
+#include <chrono>
+#include <condition_variable>
+#include <functional>
+#include <mutex>
+
+namespace base
+{
+class DeferredTask
+{
+public:
+  using Duration = std::chrono::duration<double>;
+
+  explicit DeferredTask(Duration const & duration);
+  ~DeferredTask();
+
+  void Drop();
+
+  template <typename Fn>
+  void RestartWith(Fn const && fn)
+  {
+    {
+      std::unique_lock l(m_mutex);
+      m_fn = fn;
+    }
+    m_cv.notify_one();
+  }
+
+private:
+  threads::SimpleThread m_thread;
+  std::mutex m_mutex;
+  std::condition_variable m_cv;
+  std::function<void()> m_fn;
+  Duration m_duration;
+  bool m_terminate = false;
+};
+}  // namespace base