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49 lines
1.3 KiB
49 lines
1.3 KiB
/*
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* Copyright 2014 Google Inc. All rights reserved.
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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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*/
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#ifndef FRUIT_CLASS_CONSTRUCTION_TRACKER_H
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#define FRUIT_CLASS_CONSTRUCTION_TRACKER_H
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#include <cstddef>
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/**
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* This class is useful to keep track of how many instances of a given type are created during the entire program
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* execution.
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*
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* Example use:
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* class Foo : public ConstructionTracker<Foo> {
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* ...
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* };
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*
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* int main() {
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* ...
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* assert(Foo::num_objects_constructed == 3);
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* }
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*/
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template <typename T>
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struct ConstructionTracker {
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static std::size_t num_objects_constructed;
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ConstructionTracker() {
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++num_objects_constructed;
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}
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};
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template <typename T>
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std::size_t ConstructionTracker<T>::num_objects_constructed = 0;
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#endif // FRUIT_CLASS_CONSTRUCTION_TRACKER_H
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