[boost] Re: Named params library and BGL

From: David Abrahams (dave_at_[hidden])
Date: 2004-04-15 10:02:31

Vladimir Prus <ghost_at_[hidden]> writes:

> David Abrahams wrote:
>
>>> I hope that with the named parameters library it will be possible to do:
>>>
>>>    add_edge(v1, v2, (vertex_color = 10, vertex_name = "foo"), g);
>>                       ^--------------------------------------^
>> 
>> What are these for?  That's not part of how the library works, at
>> least today... oh, I see you're trying to deal with the "unbounded
>> number of vertex properties" problem.  
>
> Right.
>
>> Probably the library should be
>> modified a bit to help with that sort of situation.  We really
>> envisioned that it could help the graph library by just making the
>> interfaces to the algorithms, which have lots of default arguments,
>> much easier.
>
> Well, I think BGL already supports default arguments in its named
> parameters. 

Yeah but they're ugly to the user, and bad to maintain for the
developer.  Adding a new parameter name ties it to all the other
parameter names because they have to be members of the same class
template.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com