mirror of
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115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file and it's implementation provide a custom fork of
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// util/task/statusor.h. This will become obsolete and will be replaced once
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// Abseil releases absl::Status.
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#ifndef THIRD_PARTY_SAPI_UTIL_STATUSOR_H_
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#define THIRD_PARTY_SAPI_UTIL_STATUSOR_H_
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#include "absl/base/internal/raw_logging.h"
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#include "absl/base/attributes.h"
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#include "absl/base/log_severity.h"
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#include "absl/status/status.h"
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#include "absl/types/variant.h"
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#include "sandboxed_api/util/raw_logging.h"
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namespace sapi {
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template <typename T>
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class StatusOr {
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public:
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explicit StatusOr() : variant_(absl::UnknownError("")) {}
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StatusOr(const absl::Status& status) : variant_(status) { EnsureNotOk(); }
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StatusOr& operator=(const absl::Status& status) {
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variant_ = status;
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EnsureNotOk();
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}
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StatusOr(const T& value) : variant_{value} {}
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StatusOr(T&& value) : variant_{std::move(value)} {}
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StatusOr(const StatusOr&) = default;
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StatusOr& operator=(const StatusOr&) = default;
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StatusOr(StatusOr&&) = default;
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StatusOr& operator=(StatusOr&&) = default;
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template <typename U>
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StatusOr(const StatusOr<U>& other) {
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*this = other;
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}
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template <typename U>
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StatusOr& operator=(const StatusOr<U>& other) {
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if (other.ok()) {
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variant_ = other.ValueOrDie();
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} else {
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variant_ = other.status();
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}
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return *this;
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}
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explicit operator bool() const { return ok(); }
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ABSL_MUST_USE_RESULT bool ok() const {
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return absl::holds_alternative<T>(variant_);
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}
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absl::Status status() const {
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return ok() ? absl::OkStatus() : absl::get<absl::Status>(variant_);
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}
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const T& ValueOrDie() const& {
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EnsureOk();
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return absl::get<T>(variant_);
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}
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T& ValueOrDie() & {
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EnsureOk();
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return absl::get<T>(variant_);
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}
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T&& ValueOrDie() && {
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EnsureOk();
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return std::move(absl::get<T>(variant_));
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}
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private:
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void EnsureOk() const {
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if (!ok()) {
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// GoogleTest needs this exact error message for death tests to work.
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SAPI_RAW_LOG(FATAL,
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"Attempting to fetch value instead of handling error %s",
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status().message());
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}
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}
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void EnsureNotOk() const {
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if (ok()) {
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SAPI_RAW_LOG(
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FATAL,
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"An OK status is not a valid constructor argument to StatusOr<T>");
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}
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}
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absl::variant<absl::Status, T> variant_;
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};
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} // namespace sapi
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#endif // THIRD_PARTY_SAPI_UTIL_STATUSOR_H_
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