[v3] complex functions with expression template reals

[Jonathan Wakely]

On 24 February 2014 09:10, Paolo Carlini wrote:
>
> Another option would be just using boost/multiprecision/mpfr.hpp when
> available. In general, I think it makes sense to have a minimum of
> infrastructure enabling tests checking interoperability with boost. If only
> we had a check_v3_target_header { args } it would be most of it, but it
> doesn't seem we do?!? Anyway I guess we can take care of that post 4.9.0 and
> commit the straightforward code tweak now. Jon?

I'd be happy with it for Stage 1, but I don't think we should apply it
now if it is only useful for people doing unusual (unsupported) things
with std::complex.