зеркало из https://github.com/mozilla/gecko-dev.git
127 строки
4.0 KiB
C++
127 строки
4.0 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_QUOTA_QMRESULTINLINES_H_
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#define DOM_QUOTA_QMRESULTINLINES_H_
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#include "nsError.h"
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#include "mozilla/Result.h"
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#include "mozilla/ResultExtensions.h"
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#include "mozilla/dom/QMResult.h"
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#include "mozilla/dom/quota/Config.h"
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#include "mozilla/dom/quota/RemoveParen.h"
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#ifdef QM_ERROR_STACKS_ENABLED
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# include "mozilla/ResultVariant.h"
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#endif
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namespace mozilla {
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#ifdef QM_ERROR_STACKS_ENABLED
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// Allow QMResult errors to use existing stack id and to increase the frame id
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// during error propagation.
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template <>
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class [[nodiscard]] GenericErrorResult<QMResult> {
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QMResult mErrorValue;
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template <typename V, typename E2>
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friend class Result;
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public:
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explicit GenericErrorResult(const QMResult& aErrorValue)
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: mErrorValue(aErrorValue) {
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MOZ_ASSERT(NS_FAILED(aErrorValue.NSResult()));
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}
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explicit GenericErrorResult(QMResult&& aErrorValue)
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: mErrorValue(std::move(aErrorValue)) {
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MOZ_ASSERT(NS_FAILED(aErrorValue.NSResult()));
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}
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explicit GenericErrorResult(const QMResult& aErrorValue,
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const ErrorPropagationTag&)
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: GenericErrorResult(aErrorValue.Propagate()) {}
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explicit GenericErrorResult(QMResult&& aErrorValue,
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const ErrorPropagationTag&)
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: GenericErrorResult(aErrorValue.Propagate()) {}
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operator QMResult() const { return mErrorValue; }
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operator nsresult() const { return mErrorValue.NSResult(); }
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};
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template <>
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struct ResultTypeTraits<QMResult> {
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static QMResult From(nsresult aValue) { return ToQMResult(aValue); }
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static QMResult From(const QMResult& aValue) { return aValue; }
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static QMResult From(QMResult&& aValue) { return std::move(aValue); }
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};
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template <typename E>
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inline Result<Ok, E> ToResult(const QMResult& aValue) {
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if (NS_FAILED(aValue.NSResult())) {
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return Err(ResultTypeTraits<E>::From(aValue));
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}
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return Ok();
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}
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template <typename E>
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inline Result<Ok, E> ToResult(QMResult&& aValue) {
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if (NS_FAILED(aValue.NSResult())) {
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return Err(ResultTypeTraits<E>::From(aValue));
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}
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return Ok();
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}
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#endif
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template <typename E = nsresult, typename V, typename E2>
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inline Result<V, E> ToResultTransform(Result<V, E2>&& aValue) {
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return std::forward<Result<V, E2>>(aValue).mapErr(
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[](auto&& err) { return ResultTypeTraits<E>::From(err); });
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}
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// TODO: Maybe move this to mfbt/ResultExtensions.h
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template <typename R, typename Func, typename... Args>
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Result<R, nsresult> ToResultGet(const Func& aFunc, Args&&... aArgs) {
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nsresult rv;
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R res = aFunc(std::forward<Args>(aArgs)..., &rv);
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if (NS_FAILED(rv)) {
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return Err(rv);
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}
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return res;
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}
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} // namespace mozilla
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// TODO: Maybe move this to mfbt/ResultExtensions.h
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#define MOZ_TO_RESULT(expr) ToResult(expr)
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#define QM_TO_RESULT(expr) ToResult<QMResult>(expr)
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#define QM_TO_RESULT_TRANSFORM(value) ToResultTransform<QMResult>(value)
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#define MOZ_TO_RESULT_GET_TYPED(resultType, ...) \
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::mozilla::ToResultGet<MOZ_REMOVE_PAREN(resultType)>(__VA_ARGS__)
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#define MOZ_TO_RESULT_INVOKE_TYPED(resultType, ...) \
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::mozilla::ToResultInvoke<MOZ_REMOVE_PAREN(resultType)>(__VA_ARGS__)
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#define QM_TO_RESULT_INVOKE_MEMBER(obj, methodname, ...) \
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::mozilla::ToResultInvokeMember<QMResult>( \
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(obj), &::mozilla::detail::DerefedType<decltype(obj)>::methodname, \
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##__VA_ARGS__)
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#define QM_TO_RESULT_INVOKE_MEMBER_TYPED(resultType, obj, methodname, ...) \
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(::mozilla::ToResultInvoke<resultType, QMResult>( \
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::std::mem_fn( \
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&::mozilla::detail::DerefedType<decltype(obj)>::methodname), \
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(obj), ##__VA_ARGS__))
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#endif
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