b35973e3e3
-- d857e6e1f9b09a3eb5abd890677a98b23346f07a by Abseil Team <absl-team@google.com>: Simplify internal TryAcquireWithSpinning. No point declaring the `result` variable: we can just return the results directly. PiperOrigin-RevId: 307045800 -- 421952252bc23be51f47f7d23f3422bad1ed382c by Derek Mauro <dmauro@google.com>: Add custom sink support for `absl::Format()` through an ADL extension mechanism. Users can now define `void AbslFormatFlush(MySink* dest, absl::string_view part)` to allow `absl::Format()` to append to a custom sink. PiperOrigin-RevId: 306929052 -- c73d5cdb62cd58ea421ed1aeeab78a0ffcfeeefb by Matt Calabrese <calabrese@google.com>: Internal-only conformance-testing macro ABSL_INTERNAL_ASSERT_CONFORMANCE_OF for compile-time and runtime checks of a specified type, expected properties of that type, and a logically-ordered series of equivalence classes of that type. PiperOrigin-RevId: 306885512 -- a8c2495a07f37d68907855e3f0535bd5c27a3b52 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 306766753 GitOrigin-RevId: d857e6e1f9b09a3eb5abd890677a98b23346f07a Change-Id: Ic23c92ac74f9ffcbb2471ff8c6691f4b7b20354b
105 lines
3 KiB
C++
105 lines
3 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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class Cord;
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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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template <class AbslCord, typename = typename std::enable_if<
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std::is_same<AbslCord, absl::Cord>::value>::type>
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inline void AbslFormatFlush(AbslCord* out, string_view s) {
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out->Append(s);
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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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