Re: Isnan

[Danny Milosavljevic]

> 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.

http://stackoverflow.com/questions/1265039/using-std-namespace

If you include math.h , isnan is called ::isnan .
If you include cmath , isnan is called std::isnan .

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?