| // | |
| // Copyright 2019 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. | |
| namespace absl { | |
| ABSL_NAMESPACE_BEGIN | |
| namespace flags_internal { | |
| // An alias for flag fast type id. This value identifies the flag value type | |
| // similarly to typeid(T), without relying on RTTI being available. In most | |
| // cases this id is enough to uniquely identify the flag's value type. In a few | |
| // cases we'll have to resort to using actual RTTI implementation if it is | |
| // available. | |
| using FlagFastTypeId = absl::base_internal::FastTypeIdType; | |
| // Options that control SetCommandLineOptionWithMode. | |
| enum FlagSettingMode { | |
| // update the flag's value unconditionally (can call this multiple times). | |
| SET_FLAGS_VALUE, | |
| // update the flag's value, but *only if* it has not yet been updated | |
| // with SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef". | |
| SET_FLAG_IF_DEFAULT, | |
| // set the flag's default value to this. If the flag has not been updated | |
| // yet (via SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef") | |
| // change the flag's current value to the new default value as well. | |
| SET_FLAGS_DEFAULT | |
| }; | |
| // Options that control ParseFrom: Source of a value. | |
| enum ValueSource { | |
| // Flag is being set by value specified on a command line. | |
| kCommandLine, | |
| // Flag is being set by value specified in the code. | |
| kProgrammaticChange, | |
| }; | |
| // Handle to FlagState objects. Specific flag state objects will restore state | |
| // of a flag produced this flag state from method CommandLineFlag::SaveState(). | |
| class FlagStateInterface { | |
| public: | |
| virtual ~FlagStateInterface(); | |
| // Restores the flag originated this object to the saved state. | |
| virtual void Restore() const = 0; | |
| }; | |
| } // namespace flags_internal | |
| ABSL_NAMESPACE_END | |
| } // namespace absl | |