xpcom/threads/MozPromiseInlines.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 #if !defined(MozPromiseInlines_h_)
   8 #  define MozPromiseInlines_h_
   9
  10 #  include <type_traits>
  11
  12 #  include "mozilla/MozPromise.h"
  13 #  include "mozilla/dom/PrimitiveConversions.h"
  14 #  include "mozilla/dom/PromiseNativeHandler.h"
  15
  16 namespace mozilla {
  17
  18 // Creates a C++ MozPromise from its JS counterpart, dom::Promise.
  19 // FromDomPromise currently only supports primitive types (int8/16/32, float,
  20 // double) And the reject value type must be a nsresult.
  21 template <typename ResolveValueT, typename RejectValueT, bool IsExclusive>
  22 RefPtr<MozPromise<ResolveValueT, RejectValueT, IsExclusive>>
  23 MozPromise<ResolveValueT, RejectValueT, IsExclusive>::FromDomPromise(
  24     dom::Promise* aDOMPromise) {
  25   static_assert(std::is_same_v<RejectValueType, nsresult>,
  26                 "Reject type must be nsresult");
  27   RefPtr<Private> p = new Private(__func__);
  28   RefPtr<dom::DomPromiseListener> listener = new dom::DomPromiseListener(
  29       aDOMPromise,
  30       [p](JSContext* aCx, JS::Handle<JS::Value> aValue) {
  31         ResolveValueT value;
  32         bool ok = dom::ValueToPrimitive<ResolveValueT,
  33                                         dom::ConversionBehavior::eDefault>(
  34             aCx, aValue, "Resolution value", &value);
  35         if (!ok) {
  36           p->Reject(NS_ERROR_FAILURE, __func__);
  37           return;
  38         }
  39         p->Resolve(value, __func__);
  40       },
  41       [p](nsresult aError) { p->Reject(aError, __func__); });
  42   return p;
  43 }
  44
  45 }  // namespace mozilla
  46
  47 #endif