Re: [boost] Metaprogramming: parameter pack expansion/evaluation trick

Subject: Re: [boost] Metaprogramming: parameter pack expansion/evaluation trick
From: Paul Fultz II (pfultz2_at_[hidden])
Date: 2015-07-03 13:42:16

> > But unfortunately there's no way to force the compiler to evaluate
> > expressions in constructor call from left to right. So it did not work
> on
> > GCC (but work on Clang).
> >
> «  []
> 
> There is. Just use {} and it's guaranteed to evaluate the args from left
> to
> right.

Also, just as a note, the Fit library has `apply_eval` that will evaluate
the
arguments in order from left to right, even on compilers that don't
guarantee
the order of {} yet:

http://fit.readthedocs.org/en/latest/apply_eval/index.html

Paul

--
View this message in context: http://boost.2283326.n4.nabble.com/Metaprogramming-parameter-pack-expansion-evaluation-trick-tp4677758p4677775.html
Sent from the Boost - Dev mailing list archive at Nabble.com.