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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_ | |
| 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_ | |
| 7 | |
| 8 #include "mojo/public/cpp/system/macros.h" | |
| 9 | |
| 10 namespace mojo { | |
| 11 namespace internal { | |
| 12 | |
| 13 // Used to allocate an instance of T that can be shared via reference counting. | |
| 14 template <typename T> | |
| 15 class SharedData { | |
| 16 public: | |
| 17 ~SharedData() { holder_->Release(); } | |
| 18 | |
| 19 SharedData() : holder_(new Holder()) {} | |
| 20 | |
| 21 explicit SharedData(const T& value) : holder_(new Holder(value)) {} | |
| 22 | |
| 23 SharedData(const SharedData<T>& other) : holder_(other.holder_) { | |
| 24 holder_->Retain(); | |
| 25 } | |
| 26 | |
| 27 SharedData<T>& operator=(const SharedData<T>& other) { | |
| 28 if (other.holder_ == holder_) | |
| 29 return *this; | |
| 30 holder_->Release(); | |
| 31 holder_ = other.holder_; | |
| 32 holder_->Retain(); | |
| 33 return *this; | |
| 34 } | |
| 35 | |
| 36 void reset() { | |
| 37 holder_->Release(); | |
| 38 holder_ = new Holder(); | |
| 39 } | |
| 40 | |
| 41 void reset(const T& value) { | |
| 42 holder_->Release(); | |
| 43 holder_ = new Holder(value); | |
| 44 } | |
| 45 | |
| 46 void set_value(const T& value) { holder_->value = value; } | |
| 47 T* mutable_value() { return &holder_->value; } | |
| 48 const T& value() const { return holder_->value; } | |
| 49 | |
| 50 private: | |
| 51 class Holder { | |
| 52 public: | |
| 53 Holder() : value(), ref_count_(1) {} | |
| 54 Holder(const T& value) : value(value), ref_count_(1) {} | |
| 55 | |
| 56 void Retain() { ++ref_count_; } | |
| 57 void Release() { | |
| 58 if (--ref_count_ == 0) | |
| 59 delete this; | |
| 60 } | |
| 61 | |
| 62 T value; | |
| 63 | |
| 64 private: | |
| 65 int ref_count_; | |
| 66 MOJO_DISALLOW_COPY_AND_ASSIGN(Holder); | |
| 67 }; | |
| 68 | |
| 69 Holder* holder_; | |
| 70 }; | |
| 71 | |
| 72 } // namespace internal | |
| 73 } // namespace mojo | |
| 74 | |
| 75 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_ | |
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