implement mementos snapshots

1 files changed, 12 insertions, 2 deletions

diff --git a/Museum.h b/Museum.h
index 27e7915..bc5b590 100644
--- a/Museum.h
+++ b/Museum.h
@@ -2,6 +2,7 @@
 
 #include <thread>
 #include <chrono>
+#include <stack>
 
 #include "People.h"
 #include "Canvas.h"
@@ -28,7 +29,7 @@ public:
 	void skip_backward();
 
 private:
-	unsigned long jump = 0;
+	int jump = 0;
 
 private:
 	bool working = true;
@@ -37,7 +38,16 @@ private:
 
 private:
 	unsigned long long tick = 0;
-	static constexpr unsigned snapshot_ticks = 50;
 	static constexpr std::chrono::milliseconds tick_interval = 15ms;
+
+private:
+	static constexpr unsigned snapshot_ticks = 50;
+	struct Snapshot {
+		unsigned long long tick;
+		Memories memories;
+	};
+	std::stack<Snapshot, std::vector<Snapshot>> history;
+	Snapshot save_snapshot();
+	void restore_snapshot(const Snapshot &);
 };