TYPEMAP
const char *		T_PV
Plotter *		O_OBJECT
MetaPlotter *		O_OBJECT
TekPlotter *		O_OBJECT
HPGLPlotter *		O_OBJECT
PCLPlotter *		O_OBJECT
FigPlotter *		O_OBJECT
PSPlotter *		O_OBJECT
AIPlotter *		O_OBJECT
PNMPlotter *		O_OBJECT
GIFPlotter *		O_OBJECT
XDrawablePlotter *	O_OBJECT
XPlotter *		O_OBJECT

OUTPUT
O_OBJECT
	sv_setref_pv( $arg, CLASS, (void*)$var );

INPUT
O_OBJECT
	if( sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG) )
		$var = ($type)SvIV((SV*)SvRV( $arg ));
	else {
		warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
		XSRETURN_UNDEF;
	}