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/* 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 */
use crate::{
interfaces::{nsIVariant, nsIWritableVariant},
use cstr::*;
mod ffi {
use super::*;
extern "C" {
// These are implemented in dom/promise/Promise.cpp
pub fn DomPromise_AddRef(promise: *const Promise);
pub fn DomPromise_Release(promise: *const Promise);
pub fn DomPromise_RejectWithVariant(promise: *const Promise, variant: *const nsIVariant);
pub fn DomPromise_ResolveWithVariant(promise: *const Promise, variant: *const nsIVariant);
pub struct Promise {
private: [u8; 0],
/// This field is a phantomdata to ensure that the Promise type and any
/// struct containing it is not safe to send across threads, as DOM is
/// generally not threadsafe.
__nosync: ::std::marker::PhantomData<::std::rc::Rc<u8>>,
impl Promise {
pub fn reject_with_undefined(&self) {
let variant = create_instance::<nsIWritableVariant>(cstr!(";1"))
.expect("Failed to create writable variant");
unsafe {
pub fn reject_with_variant(&self, variant: &nsIVariant) {
unsafe { ffi::DomPromise_RejectWithVariant(self, variant) }
pub fn resolve_with_variant(&self, variant: &nsIVariant) {
unsafe { ffi::DomPromise_ResolveWithVariant(self, variant) }
unsafe impl RefCounted for Promise {
unsafe fn addref(&self) {
unsafe fn release(&self) {