id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
8714,Allow move-only handlers,Marton <marton78@…>,chris_kohlhoff,"(See also http://stackoverflow.com/questions/17211263)

The requirement that handlers be copy constructible doesn't allow for the following idiom:

{{{
void connection::send_response()
{
    // block until previous response is sent
    std::unique_lock<std::mutex> locker(response_mutex_);

    // prepare response
    response_ = ""foo"";

    // send response back to caller. move the unique_lock into the binder
    // to keep the mutex locked until asio is done sending.
    asio::async_write(stream_,
                      asio::const_buffers_1(response_.data(), response_.size()),
                      std::bind(&connection::response_sent, shared_from_this(),
                                _1, _2, std::move(locker))
                      );
}

void connection::response_sent(const boost::system::error_code& err, std::size_t len)
{
    if (err) handle_error(err);
    // the mutex is unlocked when the binder is destroyed
}
}}}

Please remove this restriction, there is no reason for it when using C++11.",Feature Requests,new,To Be Determined,asio,Boost 1.53.0,Problem,,,