base/functional/callback_internal.cc

   1 // Copyright 2012 The Chromium Authors
   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/functional/callback_internal.h"
   6
   7 #include "base/check.h"
   8 #include "base/notreached.h"
   9
  10 namespace base {
  11 namespace internal {
  12
  13 namespace {
  14
  15 bool QueryCancellationTraitsForNonCancellables(
  16     const BindStateBase*,
  17     BindStateBase::CancellationQueryMode mode) {
  18   switch (mode) {
  19     case BindStateBase::IS_CANCELLED:
  20       return false;
  21     case BindStateBase::MAYBE_VALID:
  22       return true;
  23   }
  24   NOTREACHED();
  25 }
  26
  27 }  // namespace
  28
  29 void BindStateBaseRefCountTraits::Destruct(const BindStateBase* bind_state) {
  30   bind_state->destructor_(bind_state);
  31 }
  32
  33 BindStateBase::BindStateBase(InvokeFuncStorage polymorphic_invoke,
  34                              void (*destructor)(const BindStateBase*))
  35     : BindStateBase(polymorphic_invoke,
  36                     destructor,
  37                     &QueryCancellationTraitsForNonCancellables) {}
  38
  39 BindStateBase::BindStateBase(
  40     InvokeFuncStorage polymorphic_invoke,
  41     void (*destructor)(const BindStateBase*),
  42     bool (*query_cancellation_traits)(const BindStateBase*,
  43                                       CancellationQueryMode))
  44     : polymorphic_invoke_(polymorphic_invoke),
  45       destructor_(destructor),
  46       query_cancellation_traits_(query_cancellation_traits) {}
  47
  48 BindStateHolder& BindStateHolder::operator=(BindStateHolder&&) noexcept =
  49     default;
  50
  51 BindStateHolder::BindStateHolder(const BindStateHolder&) = default;
  52
  53 BindStateHolder& BindStateHolder::operator=(const BindStateHolder&) = default;
  54
  55 BindStateHolder::~BindStateHolder() = default;
  56
  57 void BindStateHolder::Reset() {
  58   bind_state_ = nullptr;
  59 }
  60
  61 bool BindStateHolder::IsCancelled() const {
  62   DCHECK(bind_state_);
  63   return bind_state_->IsCancelled();
  64 }
  65
  66 bool BindStateHolder::MaybeValid() const {
  67   DCHECK(bind_state_);
  68   return bind_state_->MaybeValid();
  69 }
  70
  71 }  // namespace internal
  72 }  // namespace base