Re: [Boost-users] Difficulty compiling - ASIO/BIND

Subject: Re: [Boost-users] Difficulty compiling - ASIO/BIND
From: Etienne Philip Pretorius (icewolfhunter_at_[hidden])
Date: 2008-10-17 12:13:44

David wrote:
> Hi,
> 
> I'm trying to use asio, and I run into a compiler error when using
> async_connect. I don't think this is an asio issue, perhaps a compiler or bind
> issue. Errors and code snippet below. I'm perplexed by the error, as apparently
> the compiler can't if 'this' should be passed as a pointer, or by reference. I
> also tried alternate syntax using bind and mem_fn as mentioned in the bind docs,
> but that gave exactly the same error.
> 
> What's causing this error, and what can I do to fix it?
> 
> using gcc 4.2.3:
> 
> .../boost_1_36_0/boost/bind.hpp:292: error: no match for call to
> ‘(boost::_mfi::mf1<void, Connection, boost::system::error_code&>) (Connection*&,
> boost::asio::error::basic_errors&)’

These should be boost::asio::placeholders:error

as in:

m_acceptor.async_accept(m_socket,boost::bind(&local::accept,this,boost::asio::placeholders::error));

and the function will look like this:

void local::accept(
     const boost::system::error_code& e
) {

}

> .../boost_1_36_0/boost/bind/mem_fn_template.hpp:160: note: candidates are: R
> boost::_mfi::mf1<R, T, A1>::operator()(T*, A1) const [with R = void, T =
> Connection, A1 = boost::system::error_code&]
> .../boost_1_36_0/boost/bind/mem_fn_template.hpp:179: note:                 R
> boost::_mfi::mf1<R, T, A1>::operator()(T&, A1) const [with R = void, T =
> Connection, A1 = boost::system::error_code&]
> 
> //code
> 
> class Connection
> {
> public:
> //...
>  void onConnected(boost::system::error_code&);
> //...
> };
> 
> 
> _socket.lowest_layer().async_connect(*_epit,
> boost::bind(&Connection::onConnected, this, placeholders::error));
> 
> 
> 
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