Home | History | Annotate | Download | only in base 
      1 // Copyright (c) 2012 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 #include "base/callback_internal.h"
      6 
      7 #include "base/logging.h"
      8 
      9 namespace base {
     10 namespace internal {
     11 
     12 void BindStateBase::AddRef() {
     13   AtomicRefCountInc(&ref_count_);
     14 }
     15 
     16 void BindStateBase::Release() {
     17   if (!AtomicRefCountDec(&ref_count_))
     18     destructor_(this);
     19 }
     20 
     21 CallbackBase<CopyMode::MoveOnly>::CallbackBase(CallbackBase&& c)
     22     : bind_state_(std::move(c.bind_state_)),
     23       polymorphic_invoke_(c.polymorphic_invoke_) {
     24   c.polymorphic_invoke_ = nullptr;
     25 }
     26 
     27 CallbackBase<CopyMode::MoveOnly>&
     28 CallbackBase<CopyMode::MoveOnly>::operator=(CallbackBase&& c) {
     29   bind_state_ = std::move(c.bind_state_);
     30   polymorphic_invoke_ = c.polymorphic_invoke_;
     31   c.polymorphic_invoke_ = nullptr;
     32   return *this;
     33 }
     34 
     35 void CallbackBase<CopyMode::MoveOnly>::Reset() {
     36   polymorphic_invoke_ = nullptr;
     37   // NULL the bind_state_ last, since it may be holding the last ref to whatever
     38   // object owns us, and we may be deleted after that.
     39   bind_state_ = nullptr;
     40 }
     41 
     42 bool CallbackBase<CopyMode::MoveOnly>::EqualsInternal(
     43     const CallbackBase& other) const {
     44   return bind_state_.get() == other.bind_state_.get() &&
     45          polymorphic_invoke_ == other.polymorphic_invoke_;
     46 }
     47 
     48 CallbackBase<CopyMode::MoveOnly>::CallbackBase(
     49     BindStateBase* bind_state)
     50     : bind_state_(bind_state) {
     51   DCHECK(!bind_state_.get() || bind_state_->ref_count_ == 1);
     52 }
     53 
     54 CallbackBase<CopyMode::MoveOnly>::~CallbackBase() {}
     55 
     56 CallbackBase<CopyMode::Copyable>::CallbackBase(
     57     const CallbackBase& c)
     58     : CallbackBase<CopyMode::MoveOnly>(nullptr) {
     59   bind_state_ = c.bind_state_;
     60   polymorphic_invoke_ = c.polymorphic_invoke_;
     61 }
     62 
     63 CallbackBase<CopyMode::Copyable>::CallbackBase(CallbackBase&& c)
     64     : CallbackBase<CopyMode::MoveOnly>(std::move(c)) {}
     65 
     66 CallbackBase<CopyMode::Copyable>&
     67 CallbackBase<CopyMode::Copyable>::operator=(const CallbackBase& c) {
     68   bind_state_ = c.bind_state_;
     69   polymorphic_invoke_ = c.polymorphic_invoke_;
     70   return *this;
     71 }
     72 
     73 CallbackBase<CopyMode::Copyable>&
     74 CallbackBase<CopyMode::Copyable>::operator=(CallbackBase&& c) {
     75   *static_cast<CallbackBase<CopyMode::MoveOnly>*>(this) = std::move(c);
     76   return *this;
     77 }
     78 
     79 template class CallbackBase<CopyMode::MoveOnly>;
     80 template class CallbackBase<CopyMode::Copyable>;
     81 
     82 }  // namespace internal
     83 }  // namespace base
     84