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+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_TRACKED_H_
+#define ABSL_CONTAINER_INTERNAL_TRACKED_H_
+
+#include <stddef.h>
+#include <memory>
+#include <utility>
+
+namespace absl {
+namespace container_internal {
+
+// A class that tracks its copies and moves so that it can be queried in tests.
+template <class T>
+class Tracked {
+ public:
+ Tracked() {}
+ // NOLINTNEXTLINE(runtime/explicit)
+ Tracked(const T& val) : val_(val) {}
+ Tracked(const Tracked& that)
+ : val_(that.val_),
+ num_moves_(that.num_moves_),
+ num_copies_(that.num_copies_) {
+ ++(*num_copies_);
+ }
+ Tracked(Tracked&& that)
+ : val_(std::move(that.val_)),
+ num_moves_(std::move(that.num_moves_)),
+ num_copies_(std::move(that.num_copies_)) {
+ ++(*num_moves_);
+ }
+ Tracked& operator=(const Tracked& that) {
+ val_ = that.val_;
+ num_moves_ = that.num_moves_;
+ num_copies_ = that.num_copies_;
+ ++(*num_copies_);
+ }
+ Tracked& operator=(Tracked&& that) {
+ val_ = std::move(that.val_);
+ num_moves_ = std::move(that.num_moves_);
+ num_copies_ = std::move(that.num_copies_);
+ ++(*num_moves_);
+ }
+
+ const T& val() const { return val_; }
+
+ friend bool operator==(const Tracked& a, const Tracked& b) {
+ return a.val_ == b.val_;
+ }
+ friend bool operator!=(const Tracked& a, const Tracked& b) {
+ return !(a == b);
+ }
+
+ size_t num_copies() { return *num_copies_; }
+ size_t num_moves() { return *num_moves_; }
+
+ private:
+ T val_;
+ std::shared_ptr<size_t> num_moves_ = std::make_shared<size_t>(0);
+ std::shared_ptr<size_t> num_copies_ = std::make_shared<size_t>(0);
+};
+
+} // namespace container_internal
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_TRACKED_H_