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This macro introduces the possibility to suggest the compiler that a data member doesn't need an address different from other non static data members. The usage of a macro is to maintain portability since at the moment the attribute [[no_unique_address]] is only supported by clang with at least -std=c++11 but it should be supported by all the compilers starting from C++20. Bug: webrtc:11495 Change-Id: I9f12b67b4422a2749649eaa6b004a67d5fd572d8 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173331 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32246}
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/*
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* Copyright 2015 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_BUFFER_QUEUE_H_
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#define RTC_BASE_BUFFER_QUEUE_H_
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#include <stddef.h>
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#include <deque>
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#include <vector>
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#include "rtc_base/buffer.h"
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#include "rtc_base/constructor_magic.h"
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#include "rtc_base/synchronization/sequence_checker.h"
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#include "rtc_base/system/no_unique_address.h"
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#include "rtc_base/thread_annotations.h"
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namespace rtc {
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class BufferQueue final {
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public:
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// Creates a buffer queue with a given capacity and default buffer size.
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BufferQueue(size_t capacity, size_t default_size);
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~BufferQueue();
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// Return number of queued buffers.
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size_t size() const;
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// Clear the BufferQueue by moving all Buffers from |queue_| to |free_list_|.
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void Clear();
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// ReadFront will only read one buffer at a time and will truncate buffers
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// that don't fit in the passed memory.
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// Returns true unless no data could be returned.
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bool ReadFront(void* data, size_t bytes, size_t* bytes_read);
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// WriteBack always writes either the complete memory or nothing.
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// Returns true unless no data could be written.
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bool WriteBack(const void* data, size_t bytes, size_t* bytes_written);
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bool is_writable() const {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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return queue_.size() < capacity_;
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}
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bool is_readable() const {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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return !queue_.empty();
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}
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private:
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RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
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const size_t capacity_;
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const size_t default_size_;
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std::deque<Buffer*> queue_ RTC_GUARDED_BY(sequence_checker_);
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std::vector<Buffer*> free_list_ RTC_GUARDED_BY(sequence_checker_);
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RTC_DISALLOW_COPY_AND_ASSIGN(BufferQueue);
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};
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} // namespace rtc
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#endif // RTC_BASE_BUFFER_QUEUE_H_
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