MISRA C++ compliant definition of NULL

[jorgen_h_karlsson]

According to the rationale of required rule 3-1-1 a header file should not contain or produce definitions of objects or functions.

Does this mean that the following definition of the null-pointer-constant NULL is non-compliant?

Code:

const int NULL = 0; // Compliant with rule 3-1-1?

If so, what is a compliant definition of NULL then?

Best regards,
/J