Re: [Boost-users] compile-time check that a member function exists

Subject: Re: [Boost-users] compile-time check that a member function exists
From: Joel Falcou (joel.falcou_at_[hidden])
Date: 2009-03-25 12:37:27

Igor R a écrit :
> 2008/7/23 joel falcou <joel.falcou_at_[hidden]>:
>   
>> Le Mar 22 juillet 2008 22:38, John Pretz a écrit :
>>     
>>> Thank you very much. That worked great.
>>>       
>> It's pretty rough and need to be "standardized" so it actually acts properly
>> as a MPL bool and make it parametrable on the name of the member. I think a
>> macro using BOOST_TYPEOF to get the type of the function pointer from its
>> name should be doable.
>>     
>
> Could you please elaborate a bit more?
>
> I'd like to apply the above test to something like this:
>
> template<class Impl> struct my_class
> {
>   bool f1()
>   {
>     return f1_impl(has_mem_fun_f1<Impl>::type);
>   }
>   bool f2()...
>   bool f3()...
>   //...etc...
> private:
>   bool f1_impl(mpl::bool_<true>)
>   {
>     return impl_.f1();
>   }
>   bool f1_impl(mpl::bool_<false>)
>   {
>     return false;
>   }
>   Impl impl_;
> };
>
> In other words, in this class I want to "convert" static restrictions
> to dynamic ones, i.e. to return false whenever the interface function
> is not defined in the implementation.
> So is it possible to parametrize the above test on the mem.func. name?
>
>   
Check Boost.vault for a file called introspection.zip, it contains the 
afformentionned macros in a boost-ified form.

-- 
___________________________________________
Joel Falcou - Assistant Professor
PARALL Team - LRI - Universite Paris Sud XI
Tel : [phone]