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        A resolve handler must meet the requirements for a handler.
        A value h of a resolve handler
        class should work correctly in the expression h(ec,
        i),
        where ec is an lvalue of
        type const error_code
        and i is an lvalue of type
        const ip::basic_resolver_iterator<InternetProtocol>. InternetProtocol
        is the template parameter of the resolver_service which is used to
        initiate the asynchronous operation.
      
A free function as a resolve handler:
void resolve_handler( const boost::system::error_code& ec, boost::asio::ip::tcp::resolver::iterator iterator) { ... }
A resolve handler function object:
struct resolve_handler { ... void operator()( const boost::system::error_code& ec, boost::asio::ip::tcp::resolver::iterator iterator) { ... } ... };
        A non-static class member function adapted to a resolve handler using bind():
      
void my_class::resolve_handler( const boost::system::error_code& ec, boost::asio::ip::tcp::resolver::iterator iterator) { ... } ... resolver.async_resolve(..., boost::bind(&my_class::resolve_handler, this, boost::asio::placeholders::error, boost::asio::placeholders::iterator));