Index: mojo/public/cpp/bindings/lib/shared_data.h |
diff --git a/mojo/public/cpp/bindings/lib/shared_data.h b/mojo/public/cpp/bindings/lib/shared_data.h |
deleted file mode 100644 |
index 8e93300b72534f66ce6401b03d81d577abb3b418..0000000000000000000000000000000000000000 |
--- a/mojo/public/cpp/bindings/lib/shared_data.h |
+++ /dev/null |
@@ -1,112 +0,0 @@ |
-// Copyright 2014 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
- |
-#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_ |
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_ |
- |
-#include "base/logging.h" |
-#include "base/macros.h" |
-#include "base/threading/thread_checker.h" |
- |
-namespace mojo { |
-namespace internal { |
- |
-// Used to allocate an instance of T that can be shared via reference counting. |
-// |
-// A default constructed SharedData does not have a Holder until it is set, |
-// either by assignment, or by accessing the value. As a result, it is not tied |
-// to any thread. The Holder is lazily allocated on first access. The complexity |
-// is due to the behaviour around copying. If a default constructed SharedData |
-// is copied into another, the two share the same empty state, and changing the |
-// value of one will affect the other. |
-template <typename T> |
-class SharedData { |
- public: |
- ~SharedData() { |
- if (holder_) |
- holder_->Release(); |
- } |
- |
- SharedData() : holder_(nullptr) {} |
- |
- explicit SharedData(const T& value) : holder_(new Holder(value)) {} |
- |
- SharedData(const SharedData<T>& other) { |
- other.LazyInit(); |
- holder_ = other.holder_; |
- holder_->Retain(); |
- } |
- |
- SharedData<T>& operator=(const SharedData<T>& other) { |
- other.LazyInit(); |
- if (other.holder_ == holder_) |
- return *this; |
- if (holder_) |
- holder_->Release(); |
- holder_ = other.holder_; |
- holder_->Retain(); |
- return *this; |
- } |
- |
- void reset() { |
- if (holder_) |
- holder_->Release(); |
- holder_ = nullptr; |
- } |
- |
- void reset(const T& value) { |
- if (holder_) |
- holder_->Release(); |
- holder_ = new Holder(value); |
- } |
- |
- void set_value(const T& value) { |
- LazyInit(); |
- holder_->value = value; |
- } |
- T* mutable_value() { |
- LazyInit(); |
- return &holder_->value; |
- } |
- const T& value() const { |
- LazyInit(); |
- return holder_->value; |
- } |
- |
- private: |
- class Holder { |
- public: |
- Holder() : value(), ref_count_(1) {} |
- Holder(const T& value) : value(value), ref_count_(1) {} |
- |
- void Retain() { |
- DCHECK(thread_checker_.CalledOnValidThread()); |
- ++ref_count_; |
- } |
- void Release() { |
- DCHECK(thread_checker_.CalledOnValidThread()); |
- if (--ref_count_ == 0) |
- delete this; |
- } |
- |
- T value; |
- |
- private: |
- int ref_count_; |
- base::ThreadChecker thread_checker_; |
- DISALLOW_COPY_AND_ASSIGN(Holder); |
- }; |
- |
- void LazyInit() const { |
- if (!holder_) |
- holder_ = new Holder(); |
- } |
- |
- mutable Holder* holder_; |
-}; |
- |
-} // namespace internal |
-} // namespace mojo |
- |
-#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_ |