[boost] Re: [range] update on ADL hooks

From: David Abrahams (dave_at_[hidden])
Date: 2005-03-24 09:13:42

Thomas Witt <witt_at_[hidden]> writes:

>> instead of the irritating
>> void foo()
>> {
>>     using namespace boost;
>>     begin(r);
>> }
>
> For the record I don't think it's irritating at all. It very clearly 
> states what is going on. I can see it being cumbersome though.

Cumbersomeness is irritating ;-)

> BTW shouldn't it be
>
>      using boost::begin;
>      begin(r);

Yes it should.

>> we simply now say
>> void foo()
>> {
>>     boost::begin(r);
>> }
>> and get full ADL lookup. This changes the extension protocol
>> to overiding these three functions:
>
> To me the key difference here is not the way hooks a provided, but that 
> currently the user chooses to take advantage of ADL, while with the new
> scheme the library makes the choice for the user. I am unconvinced that 
> that's actually better.

The user can always call the hook unqualified.  That's _going_ to be a
public part of the library's interface.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com