Re: [boost] [Review] TTI

Subject: Re: [boost] [Review] TTI
From: Edward Diener (eldiener_at_[hidden])
Date: 2011-07-26 17:25:35

On 7/26/2011 5:03 PM, Jeffrey Lee Hellrung, Jr. wrote:
> On Tue, Jul 26, 2011 at 1:19 PM, Noah Roberts<roberts.noah_at_[hidden]>wrote:
> [...]
>
>> One thing that I think is missing is the option to check for a named
>> callable within a type.  For example, one might want to use enable_if style
>> concept checking.  So long as a type has function 'xxx' that takes arguments
>> of type x,y,and z, and returns something convertible to type A, the concept
>> is obeyed.  I don't believe this can be done with C++03, but with C++1X I
>> was able to do something using decltype.
>>
> [...]
>
> Actually, you can approximate it pretty well in C++03 (using derivation and
> using tricks) to the point that I think it will work pretty much as you
> expect except for nullary member functions, where your queries must be more
> restrictive.  This is a useful query, but I believe Edward has decided it to
> be outside the scope of TTI.

I am not sure what the OP means by 'named callable". If it can be 
introspected within the type I can consider whether it can be done or not.

Eddie