Re: [Boost-users] [review] Fusion review

From: Joel de Guzman (joel_at_[hidden])
Date: 2006-05-05 06:35:14

David Abrahams wrote:
> David Abrahams <dave_at_[hidden]> writes:
> 
>> I object to this policy:
>>
>>   Unless otherwise noted, components are in namespace
>>   boost::fusion. For the sake of simplicity, code in this quick start
>>   implies using directives for the fusion components we will be using.
>>
>> because it is utterly ambiguous whether some of these functions are
>> supposed to be called without qualification and found via ADL or not.

Understood.

> I also note in fusion's tests, constructs like this:
> 
>   void test()
>   {
>       using namespace boost::fusion;
>       using namespace boost;
> 
>       { // Testing deref, next, prior, begin, end
> 
>           char const* s = "Hello";
>           typedef FUSION_SEQUENCE<int, char, double, char const*> seq_type;
>           seq_type v(1, 'x', 3.3, s);
>           result_of::begin<seq_type>::type i(v);
>           ^^^^^^^^^
> 
> which might (depending on whether ADL is intended) fail to test some
> important things in the library, and are certain to fail compilation
> once boost/utility/result_of.hpp gets included by a few more boost
> headers.

Right. Ok, noted.

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net