js/public/UniquePtr.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef js_UniquePtr_h
   8 #define js_UniquePtr_h
   9
  10 #include "mozilla/UniquePtr.h"
  11
  12 #include "js/Utility.h"
  13
  14 namespace js {
  15
  16 // Replacement for mozilla::UniquePtr that defaults to JS::DeletePolicy.
  17 template <typename T, typename D = JS::DeletePolicy<T>>
  18 using UniquePtr = mozilla::UniquePtr<T, D>;
  19
  20 namespace detail {
  21
  22 template <typename T>
  23 struct UniqueSelector {
  24   typedef UniquePtr<T> SingleObject;
  25 };
  26
  27 template <typename T>
  28 struct UniqueSelector<T[]> {
  29   typedef UniquePtr<T[]> UnknownBound;
  30 };
  31
  32 template <typename T, decltype(sizeof(int)) N>
  33 struct UniqueSelector<T[N]> {
  34   typedef UniquePtr<T[N]> KnownBound;
  35 };
  36
  37 }  // namespace detail
  38
  39 // Replacement for mozilla::MakeUnique that correctly calls js_new and produces
  40 // a js::UniquePtr.
  41 template <typename T, typename... Args>
  42 typename detail::UniqueSelector<T>::SingleObject MakeUnique(Args&&... aArgs) {
  43   return UniquePtr<T>(js_new<T>(std::forward<Args>(aArgs)...));
  44 }
  45
  46 template <typename T>
  47 typename detail::UniqueSelector<T>::UnknownBound MakeUnique(
  48     decltype(sizeof(int)) aN) = delete;
  49
  50 template <typename T, typename... Args>
  51 typename detail::UniqueSelector<T>::KnownBound MakeUnique(Args&&... aArgs) =
  52     delete;
  53
  54 }  // namespace js
  55
  56 #endif /* js_UniquePtr_h */