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/usr/include/boost/asio

Name	Size	Mode	Actions
detail/	-	0755	rm
execution/	-	0755	rm
generic/	-	0755	rm
impl/	-	0755	rm
ip/	-	0755	rm
local/	-	0755	rm
posix/	-	0755	rm
ssl/	-	0755	rm
traits/	-	0755	rm
ts/	-	0755	rm
windows/	-	0755	rm
any_io_executor.hpp	2625	0644	edit dl rm
associated_allocator.hpp	3791	0644	edit dl rm
associated_executor.hpp	5057	0644	edit dl rm
async_result.hpp	19423	0644	edit dl rm
awaitable.hpp	3270	0644	edit dl rm
basic_datagram_socket.hpp	47521	0644	edit dl rm
basic_deadline_timer.hpp	24158	0644	edit dl rm
basic_io_object.hpp	8096	0644	edit dl rm
basic_raw_socket.hpp	46996	0644	edit dl rm
basic_seq_packet_socket.hpp	29184	0644	edit dl rm
basic_serial_port.hpp	31912	0644	edit dl rm
basic_signal_set.hpp	19876	0644	edit dl rm
basic_socket.hpp	65516	0644	edit dl rm
basic_socket_acceptor.hpp	88062	0644	edit dl rm
basic_socket_iostream.hpp	13298	0644	edit dl rm
basic_socket_streambuf.hpp	21713	0644	edit dl rm
basic_streambuf.hpp	13714	0644	edit dl rm
basic_streambuf_fwd.hpp	920	0644	edit dl rm
basic_stream_socket.hpp	41520	0644	edit dl rm
basic_waitable_timer.hpp	28528	0644	edit dl rm
bind_executor.hpp	16510	0644	edit dl rm
buffer.hpp	83254	0644	edit dl rm
buffered_read_stream.hpp	8424	0644	edit dl rm
buffered_read_stream_fwd.hpp	699	0644	edit dl rm
buffered_stream.hpp	9074	0644	edit dl rm
buffered_stream_fwd.hpp	669	0644	edit dl rm
buffered_write_stream.hpp	8042	0644	edit dl rm
buffered_write_stream_fwd.hpp	705	0644	edit dl rm
buffers_iterator.hpp	14049	0644	edit dl rm
completion_condition.hpp	5500	0644	edit dl rm
compose.hpp	4596	0644	edit dl rm
connect.hpp	43157	0644	edit dl rm
coroutine.hpp	9897	0644	edit dl rm
co_spawn.hpp	14509	0644	edit dl rm
deadline_timer.hpp	1138	0644	edit dl rm
defer.hpp	5070	0644	edit dl rm
detached.hpp	3517	0644	edit dl rm
dispatch.hpp	4537	0644	edit dl rm
error.hpp	10351	0644	edit dl rm
execution.hpp	1871	0644	edit dl rm
execution_context.hpp	14341	0644	edit dl rm
executor.hpp	10467	0644	edit dl rm
executor_work_guard.hpp	8039	0644	edit dl rm
handler_alloc_hook.hpp	3471	0644	edit dl rm
handler_continuation_hook.hpp	1474	0644	edit dl rm
handler_invoke_hook.hpp	3744	0644	edit dl rm
high_resolution_timer.hpp	1394	0644	edit dl rm
io_context.hpp	55226	0644	edit dl rm
io_context_strand.hpp	13706	0644	edit dl rm
io_service.hpp	861	0644	edit dl rm
io_service_strand.hpp	575	0644	edit dl rm
is_applicable_property.hpp	1605	0644	edit dl rm
is_executor.hpp	1306	0644	edit dl rm
is_read_buffered.hpp	1646	0644	edit dl rm
is_write_buffered.hpp	1667	0644	edit dl rm
multiple_exceptions.hpp	1631	0644	edit dl rm
packaged_task.hpp	3358	0644	edit dl rm
placeholders.hpp	4146	0644	edit dl rm
post.hpp	4760	0644	edit dl rm
prefer.hpp	18821	0644	edit dl rm
query.hpp	8323	0644	edit dl rm
read.hpp	53894	0644	edit dl rm
read_at.hpp	27766	0644	edit dl rm
read_until.hpp	119477	0644	edit dl rm
redirect_error.hpp	1938	0644	edit dl rm
require.hpp	14926	0644	edit dl rm
require_concept.hpp	9218	0644	edit dl rm
serial_port.hpp	1010	0644	edit dl rm
serial_port_base.hpp	4975	0644	edit dl rm
signal_set.hpp	748	0644	edit dl rm
socket_base.hpp	15939	0644	edit dl rm
spawn.hpp	11793	0644	edit dl rm
ssl.hpp	848	0644	edit dl rm
static_thread_pool.hpp	826	0644	edit dl rm
steady_timer.hpp	1306	0644	edit dl rm
strand.hpp	17193	0644	edit dl rm
streambuf.hpp	826	0644	edit dl rm
system_context.hpp	2649	0644	edit dl rm
system_executor.hpp	22529	0644	edit dl rm
system_timer.hpp	1306	0644	edit dl rm
this_coro.hpp	1149	0644	edit dl rm
thread_pool.hpp	37567	0644	edit dl rm
time_traits.hpp	2281	0644	edit dl rm
unyield.hpp	381	0644	edit dl rm
uses_executor.hpp	2348	0644	edit dl rm
use_awaitable.hpp	5821	0644	edit dl rm
use_future.hpp	4820	0644	edit dl rm
version.hpp	686	0644	edit dl rm
wait_traits.hpp	1451	0644	edit dl rm
write.hpp	52959	0644	edit dl rm
write_at.hpp	29514	0644	edit dl rm
yield.hpp	482	0644	edit dl rm

Edit: /usr/include/boost/asio/buffers_iterator.hpp (14049B)

//
// buffers_iterator.hpp
// ~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef BOOST_ASIO_BUFFERS_ITERATOR_HPP
#define BOOST_ASIO_BUFFERS_ITERATOR_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include <boost/asio/detail/config.hpp>
#include <cstddef>
#include <iterator>
#include <boost/asio/buffer.hpp>
#include <boost/asio/detail/assert.hpp>
#include <boost/asio/detail/type_traits.hpp>

#include <boost/asio/detail/push_options.hpp>

namespace boost {
namespace asio {

namespace detail
{
  template <bool IsMutable>
  struct buffers_iterator_types_helper;

template <>
  struct buffers_iterator_types_helper<false>
  {
    typedef const_buffer buffer_type;
    template <typename ByteType>
    struct byte_type
    {
      typedef typename add_const<ByteType>::type type;
    };
  };

template <>
  struct buffers_iterator_types_helper<true>
  {
    typedef mutable_buffer buffer_type;
    template <typename ByteType>
    struct byte_type
    {
      typedef ByteType type;
    };
  };

template <typename BufferSequence, typename ByteType>
  struct buffers_iterator_types
  {
    enum
    {
      is_mutable = is_convertible<
          typename BufferSequence::value_type,
          mutable_buffer>::value
    };
    typedef buffers_iterator_types_helper<is_mutable> helper;
    typedef typename helper::buffer_type buffer_type;
    typedef typename helper::template byte_type<ByteType>::type byte_type;
    typedef typename BufferSequence::const_iterator const_iterator;
  };

template <typename ByteType>
  struct buffers_iterator_types<mutable_buffer, ByteType>
  {
    typedef mutable_buffer buffer_type;
    typedef ByteType byte_type;
    typedef const mutable_buffer* const_iterator;
  };

template <typename ByteType>
  struct buffers_iterator_types<const_buffer, ByteType>
  {
    typedef const_buffer buffer_type;
    typedef typename add_const<ByteType>::type byte_type;
    typedef const const_buffer* const_iterator;
  };

#if !defined(BOOST_ASIO_NO_DEPRECATED)

template <typename ByteType>
  struct buffers_iterator_types<mutable_buffers_1, ByteType>
  {
    typedef mutable_buffer buffer_type;
    typedef ByteType byte_type;
    typedef const mutable_buffer* const_iterator;
  };

template <typename ByteType>
  struct buffers_iterator_types<const_buffers_1, ByteType>
  {
    typedef const_buffer buffer_type;
    typedef typename add_const<ByteType>::type byte_type;
    typedef const const_buffer* const_iterator;
  };

#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
}

/// A random access iterator over the bytes in a buffer sequence.
template <typename BufferSequence, typename ByteType = char>
class buffers_iterator
{
private:
  typedef typename detail::buffers_iterator_types<
      BufferSequence, ByteType>::buffer_type buffer_type;

typedef typename detail::buffers_iterator_types<BufferSequence,
          ByteType>::const_iterator buffer_sequence_iterator_type;

public:
  /// The type used for the distance between two iterators.
  typedef std::ptrdiff_t difference_type;

/// The type of the value pointed to by the iterator.
  typedef ByteType value_type;

#if defined(GENERATING_DOCUMENTATION)
  /// The type of the result of applying operator->() to the iterator.
  /**
   * If the buffer sequence stores buffer objects that are convertible to
   * mutable_buffer, this is a pointer to a non-const ByteType. Otherwise, a
   * pointer to a const ByteType.
   */
  typedef const_or_non_const_ByteType* pointer;
#else // defined(GENERATING_DOCUMENTATION)
  typedef typename detail::buffers_iterator_types<
      BufferSequence, ByteType>::byte_type* pointer;
#endif // defined(GENERATING_DOCUMENTATION)

#if defined(GENERATING_DOCUMENTATION)
  /// The type of the result of applying operator*() to the iterator.
  /**
   * If the buffer sequence stores buffer objects that are convertible to
   * mutable_buffer, this is a reference to a non-const ByteType. Otherwise, a
   * reference to a const ByteType.
   */
  typedef const_or_non_const_ByteType& reference;
#else // defined(GENERATING_DOCUMENTATION)
  typedef typename detail::buffers_iterator_types<
      BufferSequence, ByteType>::byte_type& reference;
#endif // defined(GENERATING_DOCUMENTATION)

/// The iterator category.
  typedef std::random_access_iterator_tag iterator_category;

/// Default constructor. Creates an iterator in an undefined state.
  buffers_iterator()
    : current_buffer_(),
      current_buffer_position_(0),
      begin_(),
      current_(),
      end_(),
      position_(0)
  {
  }

/// Construct an iterator representing the beginning of the buffers' data.
  static buffers_iterator begin(const BufferSequence& buffers)
#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
    __attribute__ ((__noinline__))
#endif // defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
  {
    buffers_iterator new_iter;
    new_iter.begin_ = boost::asio::buffer_sequence_begin(buffers);
    new_iter.current_ = boost::asio::buffer_sequence_begin(buffers);
    new_iter.end_ = boost::asio::buffer_sequence_end(buffers);
    while (new_iter.current_ != new_iter.end_)
    {
      new_iter.current_buffer_ = *new_iter.current_;
      if (new_iter.current_buffer_.size() > 0)
        break;
      ++new_iter.current_;
    }
    return new_iter;
  }

/// Construct an iterator representing the end of the buffers' data.
  static buffers_iterator end(const BufferSequence& buffers)
#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
    __attribute__ ((__noinline__))
#endif // defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
  {
    buffers_iterator new_iter;
    new_iter.begin_ = boost::asio::buffer_sequence_begin(buffers);
    new_iter.current_ = boost::asio::buffer_sequence_begin(buffers);
    new_iter.end_ = boost::asio::buffer_sequence_end(buffers);
    while (new_iter.current_ != new_iter.end_)
    {
      buffer_type buffer = *new_iter.current_;
      new_iter.position_ += buffer.size();
      ++new_iter.current_;
    }
    return new_iter;
  }

/// Dereference an iterator.
  reference operator*() const
  {
    return dereference();
  }

/// Dereference an iterator.
  pointer operator->() const
  {
    return &dereference();
  }

/// Access an individual element.
  reference operator[](std::ptrdiff_t difference) const
  {
    buffers_iterator tmp(*this);
    tmp.advance(difference);
    return *tmp;
  }

/// Increment operator (prefix).
  buffers_iterator& operator++()
  {
    increment();
    return *this;
  }

/// Increment operator (postfix).
  buffers_iterator operator++(int)
  {
    buffers_iterator tmp(*this);
    ++*this;
    return tmp;
  }

/// Decrement operator (prefix).
  buffers_iterator& operator--()
  {
    decrement();
    return *this;
  }

/// Decrement operator (postfix).
  buffers_iterator operator--(int)
  {
    buffers_iterator tmp(*this);
    --*this;
    return tmp;
  }

/// Addition operator.
  buffers_iterator& operator+=(std::ptrdiff_t difference)
  {
    advance(difference);
    return *this;
  }

/// Subtraction operator.
  buffers_iterator& operator-=(std::ptrdiff_t difference)
  {
    advance(-difference);
    return *this;
  }

/// Addition operator.
  friend buffers_iterator operator+(const buffers_iterator& iter,
      std::ptrdiff_t difference)
  {
    buffers_iterator tmp(iter);
    tmp.advance(difference);
    return tmp;
  }

/// Addition operator.
  friend buffers_iterator operator+(std::ptrdiff_t difference,
      const buffers_iterator& iter)
  {
    buffers_iterator tmp(iter);
    tmp.advance(difference);
    return tmp;
  }

/// Subtraction operator.
  friend buffers_iterator operator-(const buffers_iterator& iter,
      std::ptrdiff_t difference)
  {
    buffers_iterator tmp(iter);
    tmp.advance(-difference);
    return tmp;
  }

/// Subtraction operator.
  friend std::ptrdiff_t operator-(const buffers_iterator& a,
      const buffers_iterator& b)
  {
    return b.distance_to(a);
  }

/// Test two iterators for equality.
  friend bool operator==(const buffers_iterator& a, const buffers_iterator& b)
  {
    return a.equal(b);
  }

/// Test two iterators for inequality.
  friend bool operator!=(const buffers_iterator& a, const buffers_iterator& b)
  {
    return !a.equal(b);
  }

/// Compare two iterators.
  friend bool operator<(const buffers_iterator& a, const buffers_iterator& b)
  {
    return a.distance_to(b) > 0;
  }

/// Compare two iterators.
  friend bool operator<=(const buffers_iterator& a, const buffers_iterator& b)
  {
    return !(b < a);
  }

/// Compare two iterators.
  friend bool operator>(const buffers_iterator& a, const buffers_iterator& b)
  {
    return b < a;
  }

/// Compare two iterators.
  friend bool operator>=(const buffers_iterator& a, const buffers_iterator& b)
  {
    return !(a < b);
  }

private:
  // Dereference the iterator.
  reference dereference() const
  {
    return static_cast<pointer>(
        current_buffer_.data())[current_buffer_position_];
  }

// Compare two iterators for equality.
  bool equal(const buffers_iterator& other) const
  {
    return position_ == other.position_;
  }

// Increment the iterator.
  void increment()
  {
    BOOST_ASIO_ASSERT(current_ != end_ && "iterator out of bounds");
    ++position_;

// Check if the increment can be satisfied by the current buffer.
    ++current_buffer_position_;
    if (current_buffer_position_ != current_buffer_.size())
      return;

// Find the next non-empty buffer.
    ++current_;
    current_buffer_position_ = 0;
    while (current_ != end_)
    {
      current_buffer_ = *current_;
      if (current_buffer_.size() > 0)
        return;
      ++current_;
    }
  }

// Decrement the iterator.
  void decrement()
  {
    BOOST_ASIO_ASSERT(position_ > 0 && "iterator out of bounds");
    --position_;

// Check if the decrement can be satisfied by the current buffer.
    if (current_buffer_position_ != 0)
    {
      --current_buffer_position_;
      return;
    }

// Find the previous non-empty buffer.
    buffer_sequence_iterator_type iter = current_;
    while (iter != begin_)
    {
      --iter;
      buffer_type buffer = *iter;
      std::size_t buffer_size = buffer.size();
      if (buffer_size > 0)
      {
        current_ = iter;
        current_buffer_ = buffer;
        current_buffer_position_ = buffer_size - 1;
        return;
      }
    }
  }

// Advance the iterator by the specified distance.
  void advance(std::ptrdiff_t n)
  {
    if (n > 0)
    {
      BOOST_ASIO_ASSERT(current_ != end_ && "iterator out of bounds");
      for (;;)
      {
        std::ptrdiff_t current_buffer_balance
          = current_buffer_.size() - current_buffer_position_;

// Check if the advance can be satisfied by the current buffer.
        if (current_buffer_balance > n)
        {
          position_ += n;
          current_buffer_position_ += n;
          return;
        }

// Update position.
        n -= current_buffer_balance;
        position_ += current_buffer_balance;

// Move to next buffer. If it is empty then it will be skipped on the
        // next iteration of this loop.
        if (++current_ == end_)
        {
          BOOST_ASIO_ASSERT(n == 0 && "iterator out of bounds");
          current_buffer_ = buffer_type();
          current_buffer_position_ = 0;
          return;
        }
        current_buffer_ = *current_;
        current_buffer_position_ = 0;
      }
    }
    else if (n < 0)
    {
      std::size_t abs_n = -n;
      BOOST_ASIO_ASSERT(position_ >= abs_n && "iterator out of bounds");
      for (;;)
      {
        // Check if the advance can be satisfied by the current buffer.
        if (current_buffer_position_ >= abs_n)
        {
          position_ -= abs_n;
          current_buffer_position_ -= abs_n;
          return;
        }

// Update position.
        abs_n -= current_buffer_position_;
        position_ -= current_buffer_position_;

// Check if we've reached the beginning of the buffers.
        if (current_ == begin_)
        {
          BOOST_ASIO_ASSERT(abs_n == 0 && "iterator out of bounds");
          current_buffer_position_ = 0;
          return;
        }

// Find the previous non-empty buffer.
        buffer_sequence_iterator_type iter = current_;
        while (iter != begin_)
        {
          --iter;
          buffer_type buffer = *iter;
          std::size_t buffer_size = buffer.size();
          if (buffer_size > 0)
          {
            current_ = iter;
            current_buffer_ = buffer;
            current_buffer_position_ = buffer_size;
            break;
          }
        }
      }
    }
  }

// Determine the distance between two iterators.
  std::ptrdiff_t distance_to(const buffers_iterator& other) const
  {
    return other.position_ - position_;
  }

buffer_type current_buffer_;
  std::size_t current_buffer_position_;
  buffer_sequence_iterator_type begin_;
  buffer_sequence_iterator_type current_;
  buffer_sequence_iterator_type end_;
  std::size_t position_;
};

/// Construct an iterator representing the beginning of the buffers' data.
template <typename BufferSequence>
inline buffers_iterator<BufferSequence> buffers_begin(
    const BufferSequence& buffers)
{
  return buffers_iterator<BufferSequence>::begin(buffers);
}

/// Construct an iterator representing the end of the buffers' data.
template <typename BufferSequence>
inline buffers_iterator<BufferSequence> buffers_end(
    const BufferSequence& buffers)
{
  return buffers_iterator<BufferSequence>::end(buffers);
}

} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#endif // BOOST_ASIO_BUFFERS_ITERATOR_HPP

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