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- /* -*- 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
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