Marco Poletti | bdf5dc0 | 2016-12-21 17:37:54 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Google Inc. All rights reserved. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef FRUIT_CLASS_CONSTRUCTION_TRACKER_H |
| 18 | #define FRUIT_CLASS_CONSTRUCTION_TRACKER_H |
| 19 | |
| 20 | /** |
| 21 | * This class is useful to keep track of how many instances of a given type are created during the entire program |
| 22 | * execution. |
| 23 | * |
| 24 | * Example use: |
| 25 | * class Foo : public ConstructionTracker<Foo> { |
| 26 | * ... |
| 27 | * }; |
| 28 | * |
| 29 | * int main() { |
| 30 | * ... |
| 31 | * assert(Foo::num_objects_constructed == 3); |
| 32 | * } |
| 33 | */ |
| 34 | template <typename T> |
| 35 | struct ConstructionTracker { |
| 36 | static std::size_t num_objects_constructed; |
| 37 | |
| 38 | ConstructionTracker() { |
| 39 | ++num_objects_constructed; |
| 40 | } |
| 41 | }; |
| 42 | |
| 43 | template <typename T> |
| 44 | std::size_t ConstructionTracker<T>::num_objects_constructed = 0; |
| 45 | |
| 46 | |
| 47 | #endif // FRUIT_CLASS_CONSTRUCTION_TRACKER_H |