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