js/public/UniquePtr.h
author Jan de Mooij <jdemooij@mozilla.com>
Mon, 27 Sep 2021 11:15:49 +0000
changeset 593265 5144ad09cfb7011b98c5422b78b82936b1343541
parent 449035 66eb1f485c1a3ea81372758bc92292c9428b17cd
permissions -rw-r--r--
Bug 1732281 part 2 - Transpile ValueToIteratorResult in Warp. r=iain Depends on D126514 Differential Revision: https://phabricator.services.mozilla.com/D126515

/* -*- 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 js_UniquePtr_h
#define js_UniquePtr_h

#include "mozilla/UniquePtr.h"

#include "js/Utility.h"

namespace js {

// Replacement for mozilla::UniquePtr that defaults to JS::DeletePolicy.
template <typename T, typename D = JS::DeletePolicy<T>>
using UniquePtr = mozilla::UniquePtr<T, D>;

namespace detail {

template <typename T>
struct UniqueSelector {
  typedef UniquePtr<T> SingleObject;
};

template <typename T>
struct UniqueSelector<T[]> {
  typedef UniquePtr<T[]> UnknownBound;
};

template <typename T, decltype(sizeof(int)) N>
struct UniqueSelector<T[N]> {
  typedef UniquePtr<T[N]> KnownBound;
};

}  // namespace detail

// Replacement for mozilla::MakeUnique that correctly calls js_new and produces
// a js::UniquePtr.
template <typename T, typename... Args>
typename detail::UniqueSelector<T>::SingleObject MakeUnique(Args&&... aArgs) {
  return UniquePtr<T>(js_new<T>(std::forward<Args>(aArgs)...));
}

template <typename T>
typename detail::UniqueSelector<T>::UnknownBound MakeUnique(
    decltype(sizeof(int)) aN) = delete;

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

}  // namespace js

#endif /* js_UniquePtr_h */