Looking around it seems the "safer" way to do this is to use the
#define isnan(x) std::isnan(x)
This is very bad because if you have any code that calls std::isnan
directly (which is legitimate) i.e.
#include <cmath>
int main() {
std::isnan(0);
return 0;
}
Then the #define you suggest will transform the call to
std::std::isnan(0);
which is invalid.
If the #define is in a public header (like it is for OpenSceneGraph),
this risks breaking a lot code for people.
-Eric
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