Re: [boost] Request for enable_if.hpp

From: Jaakko Jarvi (jajarvi_at_[hidden])
Date: 2003-12-05 11:04:02

> Can we add conditional preprocessor guards around the contents of the
> enable_if.hpp header so that the templates are only defined on
> supporting compilers?
>

Ok, I'm guarding it with BOOST_NO_SFINAE, then any use of enable_if on
a compiler which does not support SFINAE is an error.
This is the safe way, (compared to providing dummy definitions that
do not give the desired behavior).

  Jaakko

> Particularly troubling is that inclusion on compilers without template
> partial specialization results in parsing errors -- that is, even if
> enable_if is never used.
>
> Another option: provide dummy declarations that always fail on
> unsupported platforms.
>
> Thanks,
> Eric
>
>
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