gecko-dev/mfbt/UniquePtrExtensions.h
Sylvestre Ledru 265e672179 Bug 1511181 - Reformat everything to the Google coding style r=ehsan a=clang-format
# ignore-this-changeset

--HG--
extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
2018-11-30 11:46:48 +01:00

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1.5 KiB
C++

/* -*- 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(std::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