#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
MODULE = Data::Swap  PACKAGE = Data::Swap
void swap(foo, bar)
        SVref foo
        SVref bar
    PREINIT:
        void *any;
        U32 flags;
    CODE:
        any = foo->sv_any;
        flags = foo->sv_flags;
        foo->sv_any = bar->sv_any;
        foo->sv_flags = bar->sv_flags;
        bar->sv_any = any;
        bar->sv_flags = flags;