df60c82df4
-- b885a238ec13effcc407e250583e293052bd7984 by Greg Falcon <gfalcon@google.com>: Remove the dependency of //absl/hash on //absl/strings:cord. The `AbslHashValue` definition should reside in cord.h, but the implementation currently needs internal details from the hash library. This CL changes the way that Cord gains access to those internals. Note that PiecewiseCombiner remains an internal namespace API, and we still reserve the right to make changes to it. The cord_benchmark shows no statistically significant changes in hash<Cord> performance with this change. PiperOrigin-RevId: 307393448 -- ca449f230ee719d069d9217ba28a07bf5b3bd8b1 by Derek Mauro <dmauro@google.com>: Move the extension to use absl::Format() with absl::Cord as a sink to cord.h PiperOrigin-RevId: 307077162 GitOrigin-RevId: b885a238ec13effcc407e250583e293052bd7984 Change-Id: If24a90782c786fa0b4343bc7d72d053b66c153ea
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Output extension hooks for the Format library.
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// `internal::InvokeFlush` calls the appropriate flush function for the
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// specified output argument.
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// `BufferRawSink` is a simple output sink for a char buffer. Used by SnprintF.
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// `FILERawSink` is a std::FILE* based sink. Used by PrintF and FprintF.
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#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
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#define ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
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#include <cstdio>
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#include <ostream>
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#include <string>
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#include "absl/base/port.h"
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#include "absl/strings/string_view.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace str_format_internal {
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// RawSink implementation that writes into a char* buffer.
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// It will not overflow the buffer, but will keep the total count of chars
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// that would have been written.
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class BufferRawSink {
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public:
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BufferRawSink(char* buffer, size_t size) : buffer_(buffer), size_(size) {}
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size_t total_written() const { return total_written_; }
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void Write(string_view v);
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private:
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char* buffer_;
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size_t size_;
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size_t total_written_ = 0;
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};
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// RawSink implementation that writes into a FILE*.
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// It keeps track of the total number of bytes written and any error encountered
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// during the writes.
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class FILERawSink {
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public:
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explicit FILERawSink(std::FILE* output) : output_(output) {}
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void Write(string_view v);
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size_t count() const { return count_; }
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int error() const { return error_; }
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private:
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std::FILE* output_;
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int error_ = 0;
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size_t count_ = 0;
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};
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// Provide RawSink integration with common types from the STL.
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inline void AbslFormatFlush(std::string* out, string_view s) {
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out->append(s.data(), s.size());
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}
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inline void AbslFormatFlush(std::ostream* out, string_view s) {
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out->write(s.data(), s.size());
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}
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inline void AbslFormatFlush(FILERawSink* sink, string_view v) {
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sink->Write(v);
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}
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inline void AbslFormatFlush(BufferRawSink* sink, string_view v) {
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sink->Write(v);
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}
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// This is a SFINAE to get a better compiler error message when the type
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// is not supported.
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template <typename T>
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auto InvokeFlush(T* out, string_view s) -> decltype(AbslFormatFlush(out, s)) {
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AbslFormatFlush(out, s);
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}
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} // namespace str_format_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
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