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/* -*- 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 mozilla_mscom_COMApartmentRegion_h
#define mozilla_mscom_COMApartmentRegion_h

#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"

#include <objbase.h>

namespace mozilla {
namespace mscom {

template <COINIT T>
class MOZ_NON_TEMPORARY_CLASS COMApartmentRegion {
 public:
  COMApartmentRegion() : mInitResult(::CoInitializeEx(nullptr, T)) {
    // If this fires then we're probably mixing apartments on the same thread
    MOZ_ASSERT(IsValid());
  }

  ~COMApartmentRegion() {
    if (IsValid()) {
      ::CoUninitialize();
    }
  }

  bool IsValidOutermost() const { return mInitResult == S_OK; }

  bool IsValid() const { return SUCCEEDED(mInitResult); }

 private:
  COMApartmentRegion(const COMApartmentRegion&) = delete;
  COMApartmentRegion& operator=(const COMApartmentRegion&) = delete;
  COMApartmentRegion(COMApartmentRegion&&) = delete;
  COMApartmentRegion& operator=(COMApartmentRegion&&) = delete;

  HRESULT mInitResult;
};

typedef COMApartmentRegion<COINIT_APARTMENTTHREADED> STARegion;
typedef COMApartmentRegion<COINIT_MULTITHREADED> MTARegion;

}  // namespace mscom
}  // namespace mozilla

#endif  // mozilla_mscom_COMApartmentRegion_h