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Subject: Re: [boost] Boost.Conversion: functors namming
From: Vicente Botet (vicente.botet_at_[hidden])
Date: 2011-05-25 08:28:22

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.


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