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Re: Isnan

From: Andreas Enge
Subject: Re: Isnan
Date: Sun, 31 Jul 2016 13:06:07 +0200
User-agent: Mutt/1.6.1 (2016-04-27)

On Sun, Jul 31, 2016 at 12:44:27PM +0200, Danny Milosavljevic wrote:
> > Apparently the "std::" is missing in front of "isnan"; should this not be 
> > implicit?
> No. Many people in the C++ community frowns upon even doing "using namespace 
> std" at all, never mind implicitly.
> If you include math.h , isnan is called ::isnan .
> If you include cmath , isnan is called std::isnan .

Thanks for the info!

> Also, std::isnan was added with C++11, so it's a new feature. Are you 
> compiling with a C++11 compiler? What are the compiler flags used?

I am just looking at the reports on hydra. Dealii compiles in master, but not
in core-updates. (I am trying to update to 8.4.1; so far, the build process
goes beyond where it fails in the current version.)


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