[libstdc++ PATCH] TR1 'function' and 'mem_fn' support

[Chris Jefferson]

Douglas Gregor wrote:

>
> On Jan 29, 2005, at 8:44 AM, Chris Jefferson wrote:
>
>> Paolo Carlini wrote:
>>
>>> Chris Jefferson wrote:
>>>
>>>> I'm happy to adapt my tuple generation program to generate this 
>>>> header, which would have the advantage it would remove of 10 on the 
>>>> maximum size. Of course this leads to other problems which I'm not 
>>>> positive how to fix.... but it seems like it's not impossible 
>>>> someone might hit the 10-parameter (I've seen functions with more, 
>>>> although not in very nice code)
>>>
>>>
>>>
>>> By the way: *where* is it (the tuple generation program)?!?
>>>
>>> Assuming we really we want to go this way, we should provide it and 
>>> document its usage.
>>>
>> Attached is the most recent version of the maketuples.c program, 
>> which generates the header is is currently in the CVS. It could 
>> perhaps do with a little more documenting, but I think it's reasonable.
>
>
> It seems like maintaining the code for TR1 in a set of C generator 
> programs will be significantly harder than their preprocessor-based 
> counterparts. The functional_iterate.h I submitted is annoying to work 
> with (because one has to use macros for parameter lists and such), but 
> it retains the essential structure of C++ code and it's easy to make 
> minor tweaks to the source.
>
> If we're concerned about preprocessing time, we can always preprocess 
> all of the includes of functional_iterate.h for some number of 
> parameters as part of configuration.
>
I think I probably now agree. The only minor problem I have with the 
macro-based system is slightly harder to later increase the limit, 
should someone want to use tuples / function_wrappers / whatever with 
 >10 arguments / elements. I shall however agree with the maintainers on 
this issue :)

Chris