1 //
2 // detail/io_control.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 //
10 
11 #ifndef BOOST_ASIO_DETAIL_IO_CONTROL_HPP
12 #define BOOST_ASIO_DETAIL_IO_CONTROL_HPP
13 
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
15 # pragma once
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17 
18 #include <boost/asio/detail/config.hpp>
19 #include <cstddef>
20 #include <boost/asio/detail/socket_types.hpp>
21 
22 #include <boost/asio/detail/push_options.hpp>
23 
24 namespace boost {
25 namespace asio {
26 namespace detail {
27 namespace io_control {
28 
29 // I/O control command for getting number of bytes available.
30 class bytes_readable
31 {
32 public:
33   // Default constructor.
bytes_readable()34   bytes_readable()
35     : value_(0)
36   {
37   }
38 
39   // Construct with a specific command value.
bytes_readable(std::size_t value)40   bytes_readable(std::size_t value)
41     : value_(static_cast<detail::ioctl_arg_type>(value))
42   {
43   }
44 
45   // Get the name of the IO control command.
name() const46   int name() const
47   {
48     return static_cast<int>(BOOST_ASIO_OS_DEF(FIONREAD));
49   }
50 
51   // Set the value of the I/O control command.
set(std::size_t value)52   void set(std::size_t value)
53   {
54     value_ = static_cast<detail::ioctl_arg_type>(value);
55   }
56 
57   // Get the current value of the I/O control command.
get() const58   std::size_t get() const
59   {
60     return static_cast<std::size_t>(value_);
61   }
62 
63   // Get the address of the command data.
data()64   detail::ioctl_arg_type* data()
65   {
66     return &value_;
67   }
68 
69   // Get the address of the command data.
data() const70   const detail::ioctl_arg_type* data() const
71   {
72     return &value_;
73   }
74 
75 private:
76   detail::ioctl_arg_type value_;
77 };
78 
79 } // namespace io_control
80 } // namespace detail
81 } // namespace asio
82 } // namespace boost
83 
84 #include <boost/asio/detail/pop_options.hpp>
85 
86 #endif // BOOST_ASIO_DETAIL_IO_CONTROL_HPP
87