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[promises] Add some status-like types for TrySeq (#34906)
`StatusFlag` acts like a status, but is just a boolean (we don't want to accidentally treat a boolean as something that indicates failure in case it's not) Similarly `ValueOrFailure` looks like `StatusOr` but reduces the failure space to one value. --------- Co-authored-by: ctiller <[email protected]>
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| // Copyright 2023 gRPC authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #ifndef GRPC_SRC_CORE_LIB_PROMISE_STATUS_FLAG_H | ||
| #define GRPC_SRC_CORE_LIB_PROMISE_STATUS_FLAG_H | ||
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| #include <grpc/support/port_platform.h> | ||
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| #include "absl/status/status.h" | ||
| #include "absl/status/statusor.h" | ||
| #include "absl/types/optional.h" | ||
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| #include "src/core/lib/promise/detail/status.h" | ||
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| namespace grpc_core { | ||
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| // A boolean representing whether an operation succeeded (true) or failed | ||
| // (false). | ||
| class StatusFlag { | ||
| public: | ||
| explicit StatusFlag(bool value) : value_(value) {} | ||
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| bool ok() const { return value_; } | ||
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| private: | ||
| bool value_; | ||
| }; | ||
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| inline bool IsStatusOk(const StatusFlag& flag) { return flag.ok(); } | ||
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| template <> | ||
| struct StatusCastImpl<absl::Status, StatusFlag> { | ||
| static absl::Status Cast(StatusFlag flag) { | ||
| return flag.ok() ? absl::OkStatus() : absl::CancelledError(); | ||
| } | ||
| }; | ||
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| struct Failure {}; | ||
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| // A value if an operation was successful, or a failure flag if not. | ||
| template <typename T> | ||
| class ValueOrFailure { | ||
| public: | ||
| explicit ValueOrFailure(T value) : value_(std::move(value)) {} | ||
| explicit ValueOrFailure(Failure) {} | ||
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| static ValueOrFailure FromOptional(absl::optional<T> value) { | ||
| return ValueOrFailure{std::move(value)}; | ||
| } | ||
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| bool ok() const { return value_.has_value(); } | ||
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| const T& value() const { return value_.value(); } | ||
| T& value() { return value_.value(); } | ||
| const T& operator*() const { return *value_; } | ||
| T& operator*() { return *value_; } | ||
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| private: | ||
| absl::optional<T> value_; | ||
| }; | ||
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| template <typename T> | ||
| inline bool IsStatusOk(const ValueOrFailure<T>& value) { | ||
| return value.ok(); | ||
| } | ||
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| template <typename T> | ||
| struct StatusCastImpl<absl::Status, ValueOrFailure<T>> { | ||
| static absl::Status Cast(const ValueOrFailure<T> flag) { | ||
| return flag.ok() ? absl::OkStatus() : absl::CancelledError(); | ||
| } | ||
| }; | ||
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| template <typename T> | ||
| struct StatusCastImpl<absl::StatusOr<T>, ValueOrFailure<T>> { | ||
| static absl::StatusOr<T> Cast(ValueOrFailure<T> value) { | ||
| return value.ok() ? absl::StatusOr<T>(std::move(value.value())) | ||
| : absl::CancelledError(); | ||
| } | ||
| }; | ||
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| } // namespace grpc_core | ||
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| #endif // GRPC_SRC_CORE_LIB_PROMISE_STATUS_FLAG_H |
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