namespace and include

Is it safe to do this?

Code:

namespace std {
#include "math.h"
}

Thanks in advance.

Originally Posted by audinue

Is it safe to do this?

Adding declarations or definitions to the std namespace (or namespaces inside of it), other than certain template specialisations, results in undefined behaviour. Just #include <cmath> instead.

However cmath's round, etc isn't std.

Originally Posted by audinue

However cmath's round, etc isn't std.

hmm... that is true. It looks like what C99 added to <math.h> will be included in the next version of the C++ standard for <cmath>, but for now you should accept that they are not in the std namespace.

N.. Next version.. (>.<)

Ah well, make a hack. Make your "manual" std namespace and fill it in with the missing prototypes.