Re: [boost] Boost.Conversion: functors namming

Subject: Re: [boost] Boost.Conversion: functors namming
From: Vicente Botet (vicente.botet_at_[hidden])
Date: 2011-05-25 11:39:24

Thomas Heller-7 wrote:
> 
> On Wed, May 25, 2011 at 2:28 PM, Vicente Botet
> <vicente.botet_at_[hidden]> wrote:
>>
>> Vicente Botet wrote:
>>>
>>>
>>> Thomas Heller-7 wrote:
>>>>
>>>> On Wed, May 25, 2011 at 10:44 AM, Vicente Botet
>>>> <vicente.botet_at_[hidden]> wrote:
>>>>>
>>>>
>>>>> Hi,
>>>>>
>>>>> this independent overloading could be done if there was a class
>>>>> placeholder,
>>>>> but in Phoenix a placeholder is a concept, isn't it. So the
>>>>> overloading
>>>>> can
>>>>> be done only using SFINAE, which implies that one overload works for T
>>>>> that
>>>>> are placeholders and the otherfor T that are no placeholders.
>>>>>
>>>>> Let me know if I'm missing something.
>>>>
>>>> FWIW, a phoenix actor is a concept, yes. The file
>>>> boost/phoenix/core/is_actor.hpp
>>>> has only a dependency on the boost/mpl/bool.hpp header. So including
>>>> this
>>>> might
>>>> not really add to much dependency on your code.
>>>>
>>>> Another possibility certainly is to create your own trait:
>>>>
>>>> template <typename T, typename Enable>
>>>> struct enable_functor : mpl::false_ {};
>>>>
>>>> or something, that gets specialized on phoenix::is_actor once your
>>>> user includes the
>>>> header that enables functors. Using this, you gain another point of
>>>> flexibility by being able
>>>> to support other functional style libraries.
>>>>
>>>>
>>>
>>> Thanks for your clever suggestion. I will adopt it.
>>>
>>>
>>
>> Well it seems it is to clever to me. I don't reach to specialize
>> enable_functor for a T satisfying phoenix::is_actor. BTW,what is the
>> Enabled
>> parameter for? How this metafunction could be used?
>>
>> Any help would appreciated.
> 
> The Enable template parameter was exactly to specialize for phoenix actors
> ;)
> 
> 

Thanks,
this is working now. 

Vicente

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