Re: [boost] Typeof registration of partially specialized templates

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2006-01-26 14:16:39

Arkadiy Vertleyb wrote:
> "Tobias Schwinger" <tschwinger_at_[hidden]> wrote
>>Arkadiy Vertleyb wrote:
>>>"Tobias Schwinger" <tschwinger_at_[hidden]>
>>>
>>>>Would it be possible to allow Typeof registration of partially specialized
>>>>templates?
>>>
>>>It seems that it would be very hard to achieve any decent syntax :-(
>>>
>>
>>Without thinking about the macro interface for a moment it would be technically
>>possible, wouldn't it?
> 
> Yes, I think it would.

It's hot ;-).

> Right now I am skeptical about the possibility to implement anything
> readable, but you are welcome to convince me otherwise ;-)

Well, after reading Dave's post I believe it might be possible to allow

     REG_SPEC((typename T),(std::set<T,std::less<T>,std::allocator<T> >))

(with some extra work that is -- by specializing for a function with a special 
return type).

Here are some more straightforward versions which do not seem that hard to read 
to me (although they involve counting commas):

     REG_SPEC((typename T),2,(std::set<T,std::less<T>,std::allocator<T> >))
     //                    ^--- comma count

or

     REG_SPEC((typename T),3,(std::set<T,std::less<T>,std::allocator<T> >))
     //                    ^--- tuple arity

or

     REG_SPEC((typename T),(3,(std::set<T,std::less<T>,std::allocator<T> >)) )
     //                    \--- pp-array used as a string -----------------/

Anything that works with your taste among it?

<by the way>
Our list correspondence is often hard to read because our clients seem to 
disagree on where to break lines.
I set the line width down to 80 characters (which I figure should be acceptable 
-- it used to be 82 for quotes plus code) but the problem seems to persist. Is 
there anything that you can do about it, perhabs?
</by the way>

Regards,

Tobias