Listing 4 Class runtime

class xruntime : public xmsg {
protected:
       virtual void do_raise();
       xruntime(const char *what_arg, const char *where_arg,
              const char *why_arg, int copyfl);
public:
       xruntime(const char *what_arg = 0, const char *where_arg = 0,
              const char *why_arg = 0;
       virtual ~xruntime();
       };

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