[boost] Re: [Review] Named parameters library

From: David Abrahams (dave_at_[hidden])
Date: 2004-11-13 17:51:30

Rene Rivera <grafik.list_at_[hidden]> writes:

> Daniel James wrote:
>
>> David Abrahams wrote:
>> 
>>> This approach is superior to bgl_named_params in part because it
>>> avoids undue coupling and dependency in a library design.  That
>>> coupling is discussed in depth in this excerpt from C++ Template
>>> Metaprogramming (http://www.boost-consulting.com/mplbook):
>> [snipped]
>> This coupling could be avoided by using an overloaded operator to
>> combine the arguments, for example:
>>     f(slew(.799) | name("z"));
>> An advantage of this method is that it avoids the need for the
>> forwarding functions.
>
> I was just going over the library and have a related question. Is
> there a rational as to why the forwarding functions where used instead
> of overloading the "," operator?

What did you have in mind?  

     f(slew = .799, name = "z")
                  ^
The comma above will never be treated as an operator.  It's just the
way C++ works

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