mfbt/UniquePtrExtensions.h
author Mike Hommey <mh+mozilla@glandium.org>
Wed, 05 Apr 2017 13:48:52 +0900
changeset 402137 7ad4be04d16e0d86508c15c104f9686f2493061a
parent 324574 6d7c88d923886811a7d3608ec2f4b700cc30ba85
child 477694 bb85c5ee5afc151be0d07ecc48318dc69cfef446
permissions -rw-r--r--
Bug 1344038 - Move the gio protocol handler under netwerk/protocol. r=chmanchester,karlt Historically, we had support for some GNOME VFS protocols through the gnomevfs library, and this was under extension. This may not have been built by default when it was introduced, but GNOME upstream moved those things into Gtk itself, and we then got support for the new Gio-based protocol, similar to what we had through the gnomevfs library. Time passes, and we switched off the gnomevfs library entirely, and enabled the Gio-based protocol handlers by default. We then removed everything related to the gnomevfs library. Fast forward to now, and disabling Gio support in Firefox just doesn't make sense, and leaving the gio protocol handler as an extension doesn't make sense either. As it is a protocol handler, its natural place is under netwerk/protocol, which is where we're moving it here. The netwerk/protocol subdirectories being handled automatically, we don't need to add the moved directory in any DIRS variable.

/* -*- 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/. */

/* Useful extensions to UniquePtr. */

#ifndef mozilla_UniquePtrExtensions_h
#define mozilla_UniquePtrExtensions_h

#include "mozilla/fallible.h"
#include "mozilla/UniquePtr.h"

namespace mozilla {

/**
 * MakeUniqueFallible works exactly like MakeUnique, except that the memory
 * allocation performed is done fallibly, i.e. it can return nullptr.
 */
template<typename T, typename... Args>
typename detail::UniqueSelector<T>::SingleObject
MakeUniqueFallible(Args&&... aArgs)
{
  return UniquePtr<T>(new (fallible) T(Forward<Args>(aArgs)...));
}

template<typename T>
typename detail::UniqueSelector<T>::UnknownBound
MakeUniqueFallible(decltype(sizeof(int)) aN)
{
  typedef typename RemoveExtent<T>::Type ArrayType;
  return UniquePtr<T>(new (fallible) ArrayType[aN]());
}

template<typename T, typename... Args>
typename detail::UniqueSelector<T>::KnownBound
MakeUniqueFallible(Args&&... aArgs) = delete;

namespace detail {

template<typename T>
struct FreePolicy
{
  void operator()(const void* ptr) {
    free(const_cast<void*>(ptr));
  }
};

} // namespace detail

template<typename T>
using UniqueFreePtr = UniquePtr<T, detail::FreePolicy<T>>;

} // namespace mozilla

#endif // mozilla_UniquePtrExtensions_h