| // Copyright 2022 The Abseil 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. | |
| // | |
| // ----------------------------------------------------------------------------- | |
| // File: log/internal/voidify.h | |
| // ----------------------------------------------------------------------------- | |
| // | |
| // This class is used to explicitly ignore values in the conditional logging | |
| // macros. This avoids compiler warnings like "value computed is not used" and | |
| // "statement has no effect". | |
| namespace absl { | |
| ABSL_NAMESPACE_BEGIN | |
| namespace log_internal { | |
| class Voidify final { | |
| public: | |
| // This has to be an operator with a precedence lower than << but higher than | |
| // ?: | |
| template <typename T> | |
| void operator&&(const T&) const&& {} | |
| }; | |
| } // namespace log_internal | |
| ABSL_NAMESPACE_END | |
| } // namespace absl | |