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generic.h

by Michael L Powell last modified 2007-01-26 03:20

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/*ident	"@(#)cls4:incl-master/proto-headers/generic.h	1.1" */

/*******************************************************************************
 
C++ source for the C++ Language System, Release 3.0.  This product
is a new release of the original cfront developed in the computer
science research center of AT&T Bell Laboratories.

Copyright (c) 1991 AT&T and UNIX System Laboratories, Inc.
Copyright (c) 1984, 1989, 1990 AT&T.  All Rights Reserved.

THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE of AT&T and UNIX System
Laboratories, Inc.  The copyright notice above does not evidence
any actual or intended publication of such source code.

*******************************************************************************/
#ifndef GENERICH

#define GENERICH 1

/* macros to paste tokens together to form new names */
/* 4.2BSD and System V cpp's have different mechanisms for
   pasting tokens together, but 4.3BSD agrees with System V.
   ANSI C has defined a new way.
*/

#ifdef __STDC__
/* ANSI C preprocessors will not expand the arguments to a macro;
 * so we need to add a level of indirection to allow macro expansion of
 * arguments.  (Reiser preprocessors allowed the first arg to be expanded;
 * this method will allow both to be expanded, which is better than none.)
 */
#define name2(a,b)      _name2_aux(a,b)
#define _name2_aux(a,b)      a##b
#define name3(a,b,c)    _name3_aux(a,b,c)
#define _name3_aux(a,b,c)    a##b##c
#define name4(a,b,c,d)  _name4_aux(a,b,c,d)
#define _name4_aux(a,b,c,d)  a##b##c##d

#else 

#ifdef pyr
/*
 * Pyramid run SVR3, but its cpp uses the BSD4.2 version of argument pasting
 */
#define name2(a,b) a\
b
#define name3(a,b,c) a\
b\
c
#define name4(a,b,c,d) a\
b\
c\
d
#else
/*
 * Most non-ANSI cpps use the "null comment" method
 */
#define name2(a,b)	a/**/b
#define name3(a,b,c)	a/**/b/**/c
#define name4(a,b,c,d)	a/**/b/**/c/**/d
#endif

#endif

#define declare(a,t) name2(a,declare)(t)
#define implement(a,t) name2(a,implement)(t)
#define declare2(a,t1,t2) name2(a,declare2)(t1,t2)
#define implement2(a,t1,t2) name2(a,implement2)(t1,t2)


extern int genericerror(int,char*);
typedef int (*GPT)(int,char*);
#define set_handler(generic,type,x) name4(set_,type,generic,_handler)(x)
#define errorhandler(generic,type) name3(type,generic,handler)
#define callerror(generic,type,a,b) (*errorhandler(generic,type))(a,b)
#endif
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