_finite and _isnan are no members of "std"

[SimonNitzsche]

[SimonNitzsche]

those are defined, but not in the std namespace.

[nlohmann]

MSVC tests succeed with MSVC 2015 and 2017y which version are you using?

[SimonNitzsche]

I am using MS Visual Studio Community 2017 with the newest update and WindowsSDK 10.0.15063.0

It does work tho when i remove the namespace

[nlohmann]

Do you compile the test suite or some custom code?

[nlohmann]

Strangely, the error message mentions _finite and _isnan which are both not in the highlighted line.

[gregmarr]

I would check your include files for something like

#define isfinite(x) _finite(x)
#define isnan(x) _isnan(x)

[SimonNitzsche]

it is defined. but not in the std namespace. It works when i remove the std namespace in those lines. Also on of our other devs do have the issue aswell, while an other one doesn't.

[gregmarr]

If you have those defines, then the code that calls std::isfinite is being changed to instead call the non-existent function std::_finite, which is why you're getting the error.

[SimonNitzsche]

std::isfinite is NOT defined
isfinite is defined

[gregmarr]

The preprocessor doesn't care about the std:: part. That's why the error message is std::_finite is not defined and not std::isfinite is not defined.

[nlohmann]

This seems not to be an issue of the library.