| 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_
|
|
|