boost_beast/include/beast/websocket/teardown.hpp

//------------------------------------------------------------------------------
/*
    This file is part of Beast: https://github.com/vinniefalco/Beast
    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#ifndef BEAST_WEBSOCKET_TEARDOWN_HPP
#define BEAST_WEBSOCKET_TEARDOWN_HPP

#include <beast/websocket/error.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <type_traits>

namespace beast {
namespace websocket {

/** Tear down a connection.

    This tears down a connection. The implementation will call
    the overload of this function based on the `Socket` parameter
    used to consruct the socket. When `Socket` is a user defined
    type, and not a `boost::asio::ip::tcp::socket` or any
    `boost::asio::ssl::stream`, callers are responsible for
    providing a suitable overload of this function.

    @param socket The socket to tear down.

    @param ec Set to the error if any occurred.
*/
template<class Socket>
void
teardown(Socket& socket, error_code& ec) = delete;

/** Start tearing down a connection.

    This begins tearing down a connection asynchronously.
    The implementation will call the overload of this function
    based on the `Socket` parameter used to consruct the socket.
    When `Stream` is a user defined type, and not a
    `boost::asio::ip::tcp::socket` or any `boost::asio::ssl::stream`,
    callers are responsible for providing a suitable overload
    of this function.

    @param socket The socket to tear down.

    @param handler The handler to be called when the request completes.
    Copies will be made of the handler as required. The equivalent
    function signature of the handler must be:
    @code void handler(
        error_code const& error // result of operation
    ); @endcode
    Regardless of whether the asynchronous operation completes
    immediately or not, the handler will not be invoked from within
    this function. Invocation of the handler will be performed in a
    manner equivalent to using boost::asio::io_service::post().

*/
template<class Socket, class TeardownHandler>
void
async_teardown(Socket& socket, TeardownHandler&& handler) = delete;

//------------------------------------------------------------------------------

/** Tear down a `boost::asio::ip::tcp::socket`.

    This tears down a connection. The implementation will call
    the overload of this function based on the `Stream` parameter
    used to consruct the socket. When `Stream` is a user defined
    type, and not a `boost::asio::ip::tcp::socket` or any
    `boost::asio::ssl::stream`, callers are responsible for
    providing a suitable overload of this function.

    @param socket The socket to tear down.

    @param ec Set to the error if any occurred.
*/
void
teardown(
    boost::asio::ip::tcp::socket& socket,
        error_code& ec);

/** Start tearing down a `boost::asio::ip::tcp::socket`.

    This begins tearing down a connection asynchronously.
    The implementation will call the overload of this function
    based on the `Stream` parameter used to consruct the socket.
    When `Stream` is a user defined type, and not a
    `boost::asio::ip::tcp::socket` or any `boost::asio::ssl::stream`,
    callers are responsible for providing a suitable overload
    of this function.

    @param socket The socket to tear down.

    @param handler The handler to be called when the request completes.
    Copies will be made of the handler as required. The equivalent
    function signature of the handler must be:
    @code void handler(
        error_code const& error // result of operation
    ); @endcode
    Regardless of whether the asynchronous operation completes
    immediately or not, the handler will not be invoked from within
    this function. Invocation of the handler will be performed in a
    manner equivalent to using boost::asio::io_service::post().

*/
template<class TeardownHandler>
void
async_teardown(
    boost::asio::ip::tcp::socket& socket,
        TeardownHandler&& handler);

} // websocket

//------------------------------------------------------------------------------

namespace websocket_helpers {

// Calls to teardown and async_teardown must be made from
// a namespace that does not contain any overloads of these
// functions. The websocket_helpers namespace is defined here
// for that purpose.

template<class Socket>
inline
void
call_teardown(Socket& socket, websocket::error_code& ec)
{
    using websocket::teardown;
    teardown(socket, ec);
}

template<class Socket, class TeardownHandler>
inline
void
call_async_teardown(Socket& socket, TeardownHandler&& handler)
{
    using websocket::async_teardown;
    async_teardown(socket,
        std::forward<TeardownHandler>(handler));
}

} // websocket_helpers

} // beast

#include <beast/websocket/impl/teardown.ipp>

#endif