base/callback_list.cc

   1 // Copyright 2020 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/callback_list.h"
   6
   7 #include <utility>
   8
   9 #include "base/functional/callback.h"
  10
  11 namespace base {
  12
  13 CallbackListSubscription::CallbackListSubscription() = default;
  14
  15 CallbackListSubscription::CallbackListSubscription(base::OnceClosure closure)
  16     : closure_(std::move(closure)) {}
  17
  18 CallbackListSubscription::CallbackListSubscription(
  19     CallbackListSubscription&& subscription)
  20     : closure_(std::move(subscription.closure_)) {}
  21
  22 CallbackListSubscription& CallbackListSubscription::operator=(
  23     CallbackListSubscription&& subscription) {
  24   // Note: This still works properly for self-assignment.
  25   Run();
  26   closure_ = std::move(subscription.closure_);
  27   return *this;
  28 }
  29
  30 CallbackListSubscription::~CallbackListSubscription() {
  31   Run();
  32 }
  33
  34 void CallbackListSubscription::Run() {
  35   if (closure_)
  36     std::move(closure_).Run();
  37 }
  38
  39 }  // namespace base