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common.h

by Paul McJones last modified 2007-02-02 09:31

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/* @(#) common.h 1.2 1/27/86 17:46:34 */
/*ident	"@(#)cfront:incl/common.h	1.2"*/
class istream;
class ostream;

struct common {
	virtual int	cmp(common& oo) { return this==&oo; }
		/* cmp performs a three way comparison if an ordering exists:
			this==arg: return 0,
			this<arg:  return negative,
			this>arg:  return positive
		   otherwise
			this==arg: return 0,
			this!=arg: return non-zero
		*/
	virtual int operator==(common& oo) { return this==&oo; }
	virtual char*	swho() { return 0; }
	virtual int	iwho() { return 0; }
	virtual int	size() { return sizeof(common); }
	virtual ostream&	write(ostream& s) { return s;}
	virtual istream&	read(istream& s) { return s; }
		common() {}
};
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