mirror of
https://github.com/kidfromjupiter/nearby.git
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Alexey Polyudov
c3a89bb894
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I8ca8ef4727e289f3c6ea62ad73008ad718096e5d
94 lines
3.0 KiB
C++
94 lines
3.0 KiB
C++
// Copyright 2020 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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// https://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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#ifndef PLATFORM_EXCEPTION_H_
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#define PLATFORM_EXCEPTION_H_
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#include <utility>
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namespace location {
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namespace nearby {
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struct Exception {
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enum Value : int {
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NONE,
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IO,
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INTERRUPTED,
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INVALID_PROTOCOL_BUFFER,
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EXECUTION,
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// New code should use the kConstants.
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// Old CONSTANTS are deprecated, and should not be used.
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kFailed = -1, // Initial value of Exception; any unknown error.
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kSuccess = NONE, // No exception.
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kIo = IO, // IO Error happened.
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kInterrupted = INTERRUPTED, // Operation was interrupted.
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kInvalidProtocolBuffer = INVALID_PROTOCOL_BUFFER, // Couldn't parse.
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kExecution = EXECUTION, // Couldn't execute.
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kTimeout, // Operarion did not finish within specified time.
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};
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Value value {kFailed};
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};
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// ExceptionOr provides experience similar to StatusOr<T> used in
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// Google Cloud API, see:
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// https://googleapis.github.io/google-cloud-cpp/0.7.0/common/status__or_8h_source.html
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//
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// If ok() returns true, result() is a usable return value. Otherwise,
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// exception() explains why such a value is not present.
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//
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// A typical pattern of usage is as follows:
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//
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// if (!e.ok()) {
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// if (Exception::EXCEPTION_TYPE_1 == e.exception()) {
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// // Handle Exception::EXCEPTION_TYPE_1.
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// } else if (Exception::EXCEPTION_TYPE_2 == e.exception()) {
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// // Handle Exception::EXCEPTION_TYPE_2.
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// }
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//
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// return;
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// }
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//
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// // Use e.result().
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template <typename T>
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class ExceptionOr {
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public:
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ExceptionOr() = default;
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ExceptionOr(T&& result) : result_{std::move(result)}, // NOLINT
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exception_{Exception::kSuccess} {}
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ExceptionOr(const T& result) : result_{result}, // NOLINT
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exception_{Exception::kSuccess} {}
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ExceptionOr(Exception::Value exception) : exception_{exception} {} // NOLINT
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bool ok() const { return exception_.value == Exception::kSuccess; }
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T& result() & { return result_; }
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const T& result() const & { return result_; }
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T&& result() && { return std::move(result_); }
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const T&& result() const && { return std::move(result_); }
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Exception::Value exception() const { return exception_.value; }
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T GetResult() const;
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Exception GetException() const;
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private:
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T result_;
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Exception exception_ {Exception::kFailed};
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};
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_EXCEPTION_H_
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