[/
 / 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:InternetProtocol Internet protocol requirements]

An internet protocol must meet the requirements for a [link
asio.reference.Protocol protocol] as well as the additional
requirements listed below.

In the table below, `X` denotes an internet protocol class, `a` denotes a value
of type `X`, and `b` denotes a value of type `X`.

[table InternetProtocol requirements
  [[expression] [return type] [assertion/note\npre/post-conditions]]
  [
    [`X::resolver`]
    [`ip::basic_resolver<X>`]
    [The type of a resolver for the protocol.]
  ]
  [
    [`X::v4()`]
    [`X`]
    [Returns an object representing the IP version 4 protocol.]
  ]
  [
    [`X::v6()`]
    [`X`]
    [Returns an object representing the IP version 6 protocol.]
  ]
  [
    [`a == b`]
    [convertible to `bool`]
    [Returns whether two protocol objects are equal.]
  ]
  [
    [`a != b`]
    [convertible to `bool`]
    [Returns `!(a == b)`.]
  ]
]

[endsect]
