| // 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 |