[/
 / Copyright (c) 2003-2015 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:Endpoint Endpoint requirements]

An endpoint must meet the requirements of `CopyConstructible` types (C++ Std,
20.1.3), and the requirements of `Assignable` types (C++ Std, 23.1).

In the table below, `X` denotes an endpoint class, `a` denotes a value of type
`X`, `s` denotes a size in bytes, and `u` denotes an identifier.

[table Endpoint requirements
  [[expression] [type] [assertion/note\npre/post-conditions]]
  [
    [`X::protocol_type`]
    [type meeting [link asio.reference.Protocol protocol] requirements]
    []
  ]
  [
    [`X u;`]
    []
    []
  ]
  [
    [`X();`]
    []
    []
  ]
  [
    [`a.protocol();`]
    [`protocol_type`]
    []
  ]
  [
    [`a.data();`]
    [a pointer]
    [
      Returns a pointer suitable for passing as the /address/ argument to
      __POSIX__ functions such as __accept__, __getpeername__, __getsockname__
      and __recvfrom__. The implementation shall perform a
      `reinterpret_cast` on the pointer to convert it to `sockaddr*`.
    ]
  ]
  [
    [`const X& u = a;
      u.data();`]
    [a pointer]
    [
      Returns a pointer suitable for passing as the /address/ argument to
      __POSIX__ functions such as __connect__, or as the /dest_addr/ argument
      to __POSIX__ functions such as  __sendto__. The implementation shall
      perform a `reinterpret_cast` on the pointer to convert it to `const
      sockaddr*`.
    ]
  ]
  [
    [`a.size();`]
    [`size_t`]
    [
      Returns a value suitable for passing as the /address_len/ argument
      to __POSIX__ functions such as __connect__, or as the /dest_len/ argument
      to __POSIX__ functions such as __sendto__, after appropriate integer
      conversion has been performed.
    ]
  ]
  [
    [`a.resize(s);`]
    []
    [
      post: `a.size() == s`\n
      Passed the value contained in the /address_len/ argument to __POSIX__
      functions such as __accept__, __getpeername__, __getsockname__ and
      __recvfrom__, after successful completion of the function. Permitted to
      throw an exception if the protocol associated with the endpoint object `a`
      does not support the specified size.
    ]
  ]
  [
    [`a.capacity();`]
    [`size_t`]
    [
      Returns a value suitable for passing as the /address_len/ argument to
      __POSIX__ functions such as __accept__, __getpeername__, __getsockname__
      and __recvfrom__, after appropriate integer conversion has been performed.
    ]
  ]
]

[endsect]
