Re: [boost] Is there interest in a library for testing existence of a function member of class?

Subject: Re: [boost] Is there interest in a library for testing existence of a function member of class?
From: Adam Merz (adammerz_at_[hidden])
Date: 2014-11-23 06:12:23

Phil Endecott <spam_from_boost_dev <at> chezphil.org> writes:
> 
> Has anyone ever worked out how to do this without having to specify
> the type?  E.g. with BOOST_TTI_HAS_MEMBER_DATA I need to write
> something like
> 
>      has_member_data_fieldname<int ClasdName::*>::value;
> 
> The most recent time I needed something like this, I wanted to test
> whether a struct contained a field with a particular name that was
> convertible to a float (I think float or int16_t in that case).
> I would have been happy with a test for a field with that name of
> any type.  But I couldn't work out how to do it.  Any ideas?
> 

In C++11, decltype and expression SFINAE make this trait very trivial. (decltype 
is enough to not need the signature.)

Regards