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81 lines
4.2 KiB
C++
81 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_GenericModule_h
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#define mozilla_GenericModule_h
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#include <type_traits>
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#include "mozilla/AlreadyAddRefed.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Module.h"
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#define NS_GENERIC_FACTORY_CONSTRUCTOR(_InstanceClass) \
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static nsresult _InstanceClass##Constructor(REFNSIID aIID, void** aResult) { \
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RefPtr<_InstanceClass> inst; \
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\
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*aResult = nullptr; \
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\
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inst = new _InstanceClass(); \
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return inst->QueryInterface(aIID, aResult); \
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}
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#define NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod) \
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static nsresult _InstanceClass##Constructor(REFNSIID aIID, void** aResult) { \
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nsresult rv; \
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\
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RefPtr<_InstanceClass> inst; \
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\
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*aResult = nullptr; \
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\
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inst = new _InstanceClass(); \
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rv = inst->_InitMethod(); \
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if (NS_SUCCEEDED(rv)) { \
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rv = inst->QueryInterface(aIID, aResult); \
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} \
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\
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return rv; \
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}
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namespace mozilla {
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namespace detail {
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template <typename T>
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struct RemoveAlreadyAddRefed {
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using Type = T;
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};
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template <typename T>
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struct RemoveAlreadyAddRefed<already_AddRefed<T>> {
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using Type = T;
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};
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} // namespace detail
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} // namespace mozilla
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// 'Constructor' that uses an existing getter function that gets a singleton.
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#define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(_InstanceClass, _GetterProc) \
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static nsresult _InstanceClass##Constructor(REFNSIID aIID, void** aResult) { \
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RefPtr<_InstanceClass> inst; \
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\
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*aResult = nullptr; \
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\
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using T = \
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mozilla::detail::RemoveAlreadyAddRefed<decltype(_GetterProc())>::Type; \
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static_assert( \
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std::is_same_v<already_AddRefed<T>, decltype(_GetterProc())>, \
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"Singleton constructor must return already_AddRefed"); \
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static_assert( \
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std::is_base_of<_InstanceClass, T>::value, \
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"Singleton constructor must return correct already_AddRefed"); \
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inst = _GetterProc(); \
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if (nullptr == inst) { \
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return NS_ERROR_OUT_OF_MEMORY; \
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} \
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return inst->QueryInterface(aIID, aResult); \
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}
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#endif // mozilla_GenericModule_h
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