dom/media/SelfRef.h
author Sylvestre Ledru <sledru@mozilla.com>
Mon, 19 Nov 2018 13:25:37 +0000
changeset 447000 0ceae9db9ec0be18daa1a279511ad305723185d4
parent 252586 91d6e262b662a0b4e47358665e222d3927337af9
permissions -rw-r--r--
Bug 1204606 - Reformat of dom/media r=jya # skip-blame Differential Revision: https://phabricator.services.mozilla.com/D12251

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef SELF_REF_H
#define SELF_REF_H

#include "mozilla/Attributes.h"

namespace mozilla {

template <class T>
class SelfReference {
 public:
  SelfReference() : mHeld(false) {}
  ~SelfReference() {
    NS_ASSERTION(!mHeld, "Forgot to drop the self reference?");
  }

  void Take(T* t) {
    if (!mHeld) {
      mHeld = true;
      t->AddRef();
    }
  }
  void Drop(T* t) {
    if (mHeld) {
      mHeld = false;
      t->Release();
    }
  }

  MOZ_IMPLICIT operator bool() const { return mHeld; }

  SelfReference(const SelfReference& aOther) = delete;
  void operator=(const SelfReference& aOther) = delete;

 private:
  bool mHeld;
};

}  // namespace mozilla

#endif  // SELF_REF_H