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/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "nsISupports.idl"

[ptr] native nsNonConstIDPtr(nsID);

/**
 * nsIUUIDGenerator is implemented by a service that can generate
 * universally unique identifiers, ideally using any platform-native
 * method for generating UUIDs.
 */
[scriptable, uuid(138ad1b2-c694-41cc-b201-333ce936d8b8)]
interface nsIUUIDGenerator : nsISupports
{
  /**
   * Obtains a new UUID using appropriate platform-specific methods to
   * obtain a nsID that can be considered to be globally unique.
   *
   * @returns an nsID filled in with a new UUID.
   *
   * @throws NS_ERROR_FAILURE if a UUID cannot be generated (e.g. if
   * an underlying source of randomness is not available)
   */
  nsIDPtr generateUUID();

  /**
   * Obtain a new UUID like the generateUUID method, but place it in
   * the provided nsID pointer instead of allocating a new nsID.
   *
   * @param id an existing nsID pointer where the UUID will be stored.
   *
   * @throws NS_ERROR_FAILURE if a UUID cannot be generated (e.g. if
   * an underlying source of randomness is not available)
   */
  [noscript] void generateUUIDInPlace(in nsNonConstIDPtr id);
};