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td/tdutils/td/utils/MovableValue.h

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+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#pragma once
+
+namespace td {
+
+template <class T, T empty_val = T()>
+class MovableValue {
+ public:
+  MovableValue() = default;
+  MovableValue(T val) : val_(val) {
+  }
+  MovableValue(MovableValue &&other) noexcept : val_(other.val_) {
+    other.clear();
+  }
+  MovableValue &operator=(MovableValue &&other) noexcept {
+    if (this != &other) {
+      val_ = other.val_;
+      other.clear();
+    }
+    return *this;
+  }
+  MovableValue(const MovableValue &) = default;
+  MovableValue &operator=(const MovableValue &) = default;
+  ~MovableValue() = default;
+
+  void clear() {
+    val_ = empty_val;
+  }
+  const T &get() const {
+    return val_;
+  }
+
+ private:
+  T val_ = empty_val;
+};
+
+}  // namespace td