typemap

###########################
TYPEMAP

#string (char*) with automatic NULL<->undef conversion on input/output
char *                  T_STR_OR_NULL
const char *            T_STR_OR_NULL

#pointer with automatic NULL<->undef conversion on input/output
unsigned char *         T_PTR_OR_NULL
Ihandle *               T_PTR_OR_NULL
cdCanvas *              T_PTR_OR_NULL

#structs with automatic conversion to perl classes
IUP::Canvas::Bitmap     T_PTROBJ
IUP::Canvas::Palette    T_PTROBJ
IUP::Canvas::Pattern    T_PTROBJ
IUP::Canvas::Stipple    T_PTROBJ
IUP::Canvas::InternalServerImage  T_PTROBJ
IUP::Canvas::InternalState        T_PTROBJ
IUP::Canvas::InternalContext      T_PTROBJ

###########################
INPUT

T_PTR_OR_NULL
        $var = (SvIOK($arg)) ? INT2PTR($type,SvIVX($arg)) : NULL;

T_STR_OR_NULL
        $var = (SvOK($arg)) ? SvPV_nolen($arg) : NULL;

###########################
OUTPUT

T_PTR_OR_NULL
        if ($var==NULL) XSRETURN_UNDEF;
        else sv_setiv($arg, PTR2IV($var));

T_STR_OR_NULL
        if ($var==NULL) XSRETURN_UNDEF;
        else sv_setpv($arg, $var);