MISRA.LITERAL.NULL.INT

NULL used as an integer value.

MISRA-C++ Rule 4-10-1 (required): NULL shall not be used as an integer value.

Rationale

In C++, the literal 0 is both an integer type and the null-pointer-constant. To meet developer expectations, NULL should be used as the null-pointer-constant, and 0 for the integer zero.

Note: as a result of this rule, NULL is considered to have pointer type.

Example

#include <cstddef>

void f1 ( int32_t );
void f2 ( int32_t * );

void f3 ( )
{
   f1 ( NULL ); // Not-compliant, NULL used as an integer
   f2 ( NULL ); // Compliant
}