blob: 38ab26e8748ccbb481cf21136651d632c2be9248 [file] [log] [blame]
// Copyright 2020 The Pigweed 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
//
// https://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.
#pragma once
#include <utility>
#include "pw_status/status.h"
#include "pw_status/status_with_size.h"
// Macros for cleanly working with Status or StatusWithSize objects in functions
// that return Status.
#define PW_TRY(expr) _PW_TRY(_PW_TRY_UNIQUE(__LINE__), expr)
#define _PW_TRY(result, expr) \
do { \
if (auto result = (expr); !result.ok()) { \
return ::pw::internal::ConvertToStatus(result); \
} \
} while (0)
#define PW_TRY_ASSIGN(assignment_lhs, expression) \
_PW_TRY_ASSIGN(_PW_TRY_UNIQUE(__LINE__), assignment_lhs, expression)
#define _PW_TRY_ASSIGN(result, lhs, expr) \
auto result = (expr); \
if (!result.ok()) { \
return ::pw::internal::ConvertToStatus(result); \
} \
lhs = ::pw::internal::ConvertToValue(result);
// Macro for cleanly working with Status or StatusWithSize objects in functions
// that return StatusWithSize.
#define PW_TRY_WITH_SIZE(expr) _PW_TRY_WITH_SIZE(_PW_TRY_UNIQUE(__LINE__), expr)
#define _PW_TRY_WITH_SIZE(result, expr) \
do { \
if (auto result = (expr); !result.ok()) { \
return ::pw::internal::ConvertToStatusWithSize(result); \
} \
} while (0)
#define _PW_TRY_UNIQUE(line) _PW_TRY_UNIQUE_EXPANDED(line)
#define _PW_TRY_UNIQUE_EXPANDED(line) _pw_try_unique_name_##line
namespace pw::internal {
constexpr Status ConvertToStatus(Status status) { return status; }
constexpr Status ConvertToStatus(StatusWithSize status_with_size) {
return status_with_size.status();
}
constexpr size_t ConvertToValue(StatusWithSize status_with_size) {
return status_with_size.size();
}
constexpr StatusWithSize ConvertToStatusWithSize(Status status) {
return StatusWithSize(status, 0);
}
constexpr StatusWithSize ConvertToStatusWithSize(
StatusWithSize status_with_size) {
return status_with_size;
}
} // namespace pw::internal