[/
 / Copyright (c) 2003-2025 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:Protocol Protocol requirements]

A type `X` meets the `Protocol` requirements if it satisfies the requirements
of `Destructible` (C++Std [destructible]), `CopyConstructible` (C++Std
[copyconstructible]), and `CopyAssignable` (C++Std [copyassignable]), as well
as the additional requirements listed below.

No copy or move operation of the type `X` shall exit via an exception.

[table Protocol requirements
  [[expression] [return type] [assertion/note[br]pre/post-conditions]]
  [
    [`X::endpoint`]
    [type meeting [link asio.reference.Endpoint endpoint] requirements]
    []
  ]
]

In the table below, `a` denotes a (possibly const) value of type `X`.

[table Protocol requirements for extensible implementations
  [[expression] [return type] [assertion/note[br]pre/post-conditions]]
  [
    [`a.family()`]
    [`int`]
    [
      Returns a value suitable for passing as the /domain/ argument to
      __POSIX__ __socket__ (or equivalent).
    ]
  ]
  [
    [`a.type()`]
    [`int`]
    [
      Returns a value suitable for passing as the /type/ argument to __POSIX__
      __socket__ (or equivalent).
    ]
  ]
  [
    [`a.protocol()`]
    [`int`]
    [
      Returns a value suitable for passing as the /protocol/ argument to
      __POSIX__ __socket__ (or equivalent).
    ]
  ]
]

[endsect]
