Initial commit

include/ftxui/util/autoreset.hpp

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+// Copyright 2020 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+#ifndef FTXUI_UTIL_AUTORESET_HPP
+#define FTXUI_UTIL_AUTORESET_HPP
+
+#include <utility>
+
+namespace ftxui {
+
+/// Assign a value to a variable, reset its old value when going out of scope.
+template <typename T>
+class AutoReset {
+ public:
+  AutoReset(T* variable, T new_value)
+      : variable_(variable), previous_value_(std::move(*variable)) {
+    *variable_ = std::move(new_value);
+  }
+  ~AutoReset() { *variable_ = std::move(previous_value_); }
+
+ private:
+  T* variable_;
+  T previous_value_;
+};
+
+}  // namespace ftxui
+
+#endif /* end of include guard: FTXUI_UTIL_AUTORESET_HPP */