// Copyright 2021 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. #ifndef ABSL_STRINGS_INTERNAL_CORD_REP_CONSUME_H_ #define ABSL_STRINGS_INTERNAL_CORD_REP_CONSUME_H_ #include <functional> #include "absl/functional/function_ref.h" #include "absl/strings/internal/cord_internal.h" namespace absl { ABSL_NAMESPACE_BEGIN namespace cord_internal { // Functor for the Consume() and ReverseConsume() functions: // void ConsumeFunc(CordRep* rep, size_t offset, size_t length); // See the Consume() and ReverseConsume() function comments for documentation. using ConsumeFn = FunctionRef<void(CordRep*, size_t, size_t)>; // Consume() and ReverseConsume() consume CONCAT based trees and invoke the // provided functor with the contained nodes in the proper forward or reverse // order, which is used to convert CONCAT trees into other tree or cord data. // All CONCAT and SUBSTRING nodes are processed internally. The 'offset` // parameter of the functor is non-zero for any nodes below SUBSTRING nodes. // It's up to the caller to form these back into SUBSTRING nodes or otherwise // store offset / prefix information. These functions are intended to be used // only for migration / transitional code where due to factors such as ODR // violations, we can not 100% guarantee that all code respects 'new format' // settings and flags, so we need to be able to parse old data on the fly until // all old code is deprecated / no longer the default format. void Consume(CordRep* rep, ConsumeFn consume_fn); void ReverseConsume(CordRep* rep, ConsumeFn consume_fn); } // namespace cord_internal ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_STRINGS_INTERNAL_CORD_REP_CONSUME_H_