timeline.h

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#ifndef ION_PROFILE_TIMELINE_H_
#define ION_PROFILE_TIMELINE_H_

#include <memory>

#include "base/macros.h"
#include "ion/base/logging.h"
#include "ion/profile/timelineevent.h"
#include "ion/profile/timelinenode.h"

class Timeline {
 public:
  Timeline() : root_(new TimelineNode("root")) {}
  explicit Timeline(std::unique_ptr<TimelineNode> root)
      : root_(std::move(root)) {}
  Timeline(Timeline&& other) : root_(std::move(other.root_)) {}

  class const_iterator {
   public:
    const_iterator(const TimelineNode* node, const TimelineNode* root)
        : node_(node), root_(root) {}
    const TimelineNode* operator*() const { return node_; }
    const_iterator operator++();
    bool operator==(const const_iterator& other) const {
      return node_ == other.node_;
    }
    bool operator!=(const const_iterator& other) const {
      return !(*this == other);
    }

   private:
    const TimelineNode* node_;
    const TimelineNode* root_;
  };

  const_iterator begin() const  {
    return ++const_iterator(root_.get(), root_.get());
  }
  const_iterator end() const { return const_iterator(nullptr, root_.get()); }

  const TimelineNode* GetRoot() const { return root_.get(); }

 private:
  std::unique_ptr<TimelineNode> root_;
  DISALLOW_COPY_AND_ASSIGN(Timeline);
};

#endif  // ION_PROFILE_TIMELINE_H_