59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// Copyright 2019 The MediaPipe 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 MEDIAPIPE_FRAMEWORK_LIFETIME_TRACKER_H_
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#define MEDIAPIPE_FRAMEWORK_LIFETIME_TRACKER_H_
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#include <atomic>
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#include "absl/memory/memory.h"
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namespace mediapipe {
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// This class can be used to create objects whose lifetime is tracked by a
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// counter. This is useful for testing.
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// There is a separate counter per LifetimeTracker instance, and it counts the
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// number of LifetimeTracker::Object instances created by that tracker.
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// Therefore, you can use a single tracker with multiple objects to track
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// overall behavior; or you can use separate trackers, with one object each, if
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// you need to track each object's lifetime separately.
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class LifetimeTracker {
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public:
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class Object {
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public:
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explicit Object(LifetimeTracker* tracker) : tracker_(tracker) {
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++tracker_->live_count_;
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}
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~Object() { --tracker_->live_count_; }
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private:
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LifetimeTracker* const tracker_;
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};
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// Creates and returns a new tracked object.
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std::unique_ptr<Object> MakeObject() {
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return absl::make_unique<Object>(this);
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}
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// Returns the number of tracked objects currently alive.
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int live_count() { return live_count_; }
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private:
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std::atomic<int> live_count_ = ATOMIC_VAR_INIT(0);
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_FRAMEWORK_LIFETIME_TRACKER_H_
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