id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8989	asio::ip namespace issues, and proposed solution	vinnie.falco@…	chris_kohlhoff	"Given an [http://www.boost.org/doc/libs/1_54_0/doc/html/boost_asio/reference/InternetProtocol.html InternetProtocol] (usually [http://www.boost.org/doc/libs/1_54_0/doc/html/boost_asio/reference/ip__tcp.html ip::tcp]), there's no generic way to get access to these classes:

{{{
class boost::asio::ip::address_v4;
class boost::asio::ip::address_v6;
}}}

The reason is that boost::tcp::ip is a namespace and not a type.

I propose adding these to the requirements for [http://www.boost.org/doc/libs/1_54_0/doc/html/boost_asio/reference/InternetProtocol.html InternetProtocol]:

{{{
X::address_v4, return type boost::asio::ip::address_v4
X::address_v6, return type boost::asio::ip::address_v6
}}}

This would enable template classes parameterized on [http://www.boost.org/doc/libs/1_54_0/doc/html/boost_asio/reference/InternetProtocol.html InternetProtocol] to be able to choose an address type. For example:

{{{
template <typename InternetProtcol>
struct Details
{
    typedef InternetProtocol          protocol_type;
    typedef protocol_type::endpoint   endpoint_type;

    // Good, with this proposal
    typedef protocol_type::address_v4 address_v4;
    endpoint_type get_endpoint ()
    {
        return endpoint_type (address_v4::any (), 1053);
    }

    // Bad, the only current solution
    typedef boost::asio::ip::address_v4 address_v4;
    endpoint_type get_endpoint_bad ()
    {
        return endpoint_type (address_v4::any (), 1053);
    }
};
}}}
"	Feature Requests	new	To Be Determined	asio	Boost 1.54.0	Problem