strings/internal/stringify_sink.h

0001 // Copyright 2022 The Abseil Authors
0002 //
0003 // Licensed under the Apache License, Version 2.0 (the "License");
0004 // you may not use this file except in compliance with the License.
0005 // You may obtain a copy of the License at
0006 //
0007 //     https://www.apache.org/licenses/LICENSE-2.0
0008 //
0009 // Unless required by applicable law or agreed to in writing, software
0010 // distributed under the License is distributed on an "AS IS" BASIS,
0011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0012 // See the License for the specific language governing permissions and
0013 // limitations under the License.
0014
0015 #ifndef ABSL_STRINGS_INTERNAL_STRINGIFY_SINK_H_
0016 #define ABSL_STRINGS_INTERNAL_STRINGIFY_SINK_H_
0017
0018 #include <string>
0019 #include <type_traits>
0020 #include <utility>
0021
0022 #include "absl/strings/string_view.h"
0023
0024 namespace absl {
0025 ABSL_NAMESPACE_BEGIN
0026
0027 namespace strings_internal {
0028 class StringifySink {
0029  public:
0030   void Append(size_t count, char ch);
0031
0032   void Append(string_view v);
0033
0034   // Support `absl::Format(&sink, format, args...)`.
0035   friend void AbslFormatFlush(StringifySink* sink, absl::string_view v) {
0036     sink->Append(v);
0037   }
0038
0039  private:
0040   template <typename T>
0041   friend string_view ExtractStringification(StringifySink& sink, const T& v);
0042
0043   std::string buffer_;
0044 };
0045
0046 template <typename T>
0047 string_view ExtractStringification(StringifySink& sink, const T& v) {
0048   AbslStringify(sink, v);
0049   return sink.buffer_;
0050 }
0051
0052 }  // namespace strings_internal
0053
0054 ABSL_NAMESPACE_END
0055 }  // namespace absl
0056
0057 #endif  // ABSL_STRINGS_INTERNAL_STRINGIFY_SINK_H_