1 files changed, 32 insertions, 0 deletions
diff --git a/competition/multilog.h b/competition/multilog.h
new file mode 100644
index 0000000..ba0ff4d
--- /dev/null
+++ b/competition/multilog.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <vector>
+#include <string_view>
+#include <mutex>
+
+using namespace std;
+
+
+// Access is thread-safe
+class MultiLog {
+	struct Item {
+		int id;
+		string line;
+		bool complete = false;
+
+		Item();
+	};
+
+	mutex mut;
+	vector<Item> items;
+
+	// Methods assume mutex is taken.
+	size_t findId(int id);
+	void redrawLine(size_t idx);
+
+public:
+	// Returns id of new item
+	int add(const string_view prefix);
+	void append(int id, const string_view text);
+	void complete(int id);
+};