with C++11 we have to be explicit about the namespace of isnan
with C++11 we have to be explicit about the namespace of isnan

chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc