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