text: //
  // detail/io_control.hpp
  // ~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2017 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_DETAIL_IO_CONTROL_HPP
  #define BOOST_ASIO_DETAIL_IO_CONTROL_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 <boost/asio/detail/socket_types.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace detail {
  namespace io_control {
  
  // I/O control command for getting number of bytes available.
  class bytes_readable
  {
  public:
    // Default constructor.
    bytes_readable()
      : value_(0)
    {
    }
  
    // Construct with a specific command value.
    bytes_readable(std::size_t value)
      : value_(static_cast<detail::ioctl_arg_type>(value))
    {
    }
  
    // Get the name of the IO control command.
    int name() const
    {
      return static_cast<int>(BOOST_ASIO_OS_DEF(FIONREAD));
    }
  
    // Set the value of the I/O control command.
    void set(std::size_t value)
    {
      value_ = static_cast<detail::ioctl_arg_type>(value);
    }
  
    // Get the current value of the I/O control command.
    std::size_t get() const
    {
      return static_cast<std::size_t>(value_);
    }
  
    // Get the address of the command data.
    detail::ioctl_arg_type* data()
    {
      return &value_;
    }
  
    // Get the address of the command data.
    const detail::ioctl_arg_type* data() const
    {
      return &value_;
    }
  
  private:
    detail::ioctl_arg_type value_;
  };
  
  } // namespace io_control
  } // namespace detail
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // BOOST_ASIO_DETAIL_IO_CONTROL_HPP
  