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Path: utzoo!watmath!clyde!cbosgd!ihnp4!pegasus!hansen
From: hansen@pegasus.UUCP (Tony L. Hansen)
Newsgroups: net.lang.c++
Subject: Re: pointer to function argument bug
Message-ID: <2761@pegasus.UUCP>
Date: Thu, 10-Apr-86 22:30:11 EST
Article-I.D.: pegasus.2761
Posted: Thu Apr 10 22:30:11 1986
Date-Received: Sat, 19-Apr-86 03:32:57 EST
References: <5275@alice.uUCp>
Reply-To: hansen@pegasus.UUCP (60545457-Tony L. Hansen;LZ 3B-315;6243)
Organization: AT&T-IS Labs, Lincroft, NJ
Lines: 35
Keywords: function pointer
Summary: how to get function pointers w/o typedefs

< > From: cudcv@daisy.warwick.UUCP (Rob McMahon)
< > ... why
< > typedef int (*PF)(int);
< > int f ( PF f1 ) { ; }
< > ... instead of
< > int f ( int (*f1)(int) ) { ; }
<
< From: alice!bs (Bjarne Stroustrup)
<
< Because cfront suffers from a dumb YACC grammar. Try
< 
< int f ( auto int (*f1)(int) ) { }

My copy of cfront accepts the above code, but then the generated code causes
/bin/cc to complain!

    "junk.c", line 2: illegal class

Passing this back to Bjarne gave this reply:

< ***> So it does! curse it. Sorry.  Re-reading my code, I find that 
<	I actually use
< 
<     	int f ( register int (*f1)(int) ) { }
< 
< 	but I think that I'll make the ``auto'' version work.
< 
< 	Could you possibly post a ``sorry, no AUTO, but REGISTER does
<	the trick'' note on the net?

There you have it. Use "register" instead of "auto" to get your pointers to
functions.

					Tony Hansen
					ihnp4!pegasus!hansen