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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Useful extensions to UniquePtr. */
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#ifndef mozilla_UniquePtrExtensions_h
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#define mozilla_UniquePtrExtensions_h
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#include "mozilla/fallible.h"
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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/**
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* MakeUniqueFallible works exactly like MakeUnique, except that the memory
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* allocation performed is done fallibly, i.e. it can return nullptr.
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*/
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template <typename T, typename... Args>
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typename detail::UniqueSelector<T>::SingleObject MakeUniqueFallible(
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Args&&... aArgs) {
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return UniquePtr<T>(new (fallible) T(std::forward<Args>(aArgs)...));
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}
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template <typename T>
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typename detail::UniqueSelector<T>::UnknownBound MakeUniqueFallible(
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decltype(sizeof(int)) aN) {
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typedef typename RemoveExtent<T>::Type ArrayType;
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return UniquePtr<T>(new (fallible) ArrayType[aN]());
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}
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template <typename T, typename... Args>
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typename detail::UniqueSelector<T>::KnownBound MakeUniqueFallible(
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Args&&... aArgs) = delete;
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namespace detail {
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template <typename T>
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struct FreePolicy {
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void operator()(const void* ptr) { free(const_cast<void*>(ptr)); }
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};
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} // namespace detail
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template <typename T>
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using UniqueFreePtr = UniquePtr<T, detail::FreePolicy<T>>;
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} // namespace mozilla
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#endif // mozilla_UniquePtrExtensions_h
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