[/
 / Copyright (c) 2003-2016 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)
 /]

[section:GettableSocketOption Gettable socket option requirements]

In the table below, `X` denotes a socket option class, `a` denotes a value of
`X`, `p` denotes a value that meets the [link asio.reference.Protocol
protocol] requirements, and `u` denotes an identifier.

[table GettableSocketOption requirements
  [[expression] [type] [assertion/note\npre/post-conditions]]
  [
    [`a.level(p);`]
    [`int`]
    [
      Returns a value suitable for passing as the /level/ argument to __POSIX__
      __getsockopt__ (or equivalent).
    ]
  ]
  [
    [`a.name(p);`]
    [`int`]
    [
      Returns a value suitable for passing as the /option_name/ argument to
      __POSIX__ __getsockopt__ (or equivalent).
    ]
  ]
  [
    [`a.data(p);`]
    [a pointer, convertible to `void*`]
    [
      Returns a pointer suitable for passing as the /option_value/ argument to
      __POSIX__ __getsockopt__ (or equivalent).
    ]
  ]
  [
    [`a.size(p);`]
    [`size_t`]
    [
      Returns a value suitable for passing as the /option_len/ argument to
      __POSIX__ __getsockopt__ (or equivalent), after appropriate
      integer conversion has been performed.
    ]
  ]
  [
    [`a.resize(p, s);`]
    []
    [
      post: `a.size(p) == s`.\n
      Passed the value contained in the /option_len/ argument to __POSIX__
      __getsockopt__ (or equivalent) after successful completion of the
      function. Permitted to throw an exception if the socket option object `a`
      does not support the specified size.
    ]
  ]
]

[endsect]