Ensure that there exists a pointer of the appropriate type to the variable that has been passed as an actual argument from FORTRAN to a C routine. Since FORTRAN usually passes arguments by reference, the pointer is commonly available directly from the argument list, so this macro is null. (type not LOCATOR.)

GENPTR_type(arg)

arg

GENPTR_type(arg)

will expand as follows:

All systems:

GENPTR_CHARACTER