bug

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1 total messages Started by Bjarne Stroustrup Sat, 24 May 1986 13:29

#207

Author: Bjarne Stroustrup
Date: Sat, 24 May 1986 13:29

29 lines
1433 bytes

cit-vax.Caltech.Edu (Jonathan P. Leech)
>
>    The following code:
> 
> 	int spam() {
> 	    double (*z)[4] = (double (*)[4])0;
> 	}
> 
>     is legal C code. It is not legal C++ code (release 1.0),
> generating the following error message:
> 
>     "junk.c", line 2: error:  z is undefined
> 
>     Declarations of this form seem not to cause any problem in member
> functions of classes (the only other context in which I had occasion
> to use them in C++ until tonight). This is a most annoying bug. Any
> help in fixes or workarounds would greatly appreciated.

Yes that is a nasty cfront bug. Sorry. The code is legal C++ but I have
persistent problems convincing YACC about that.

Fortunately the workaround is simple:

	int spam() {
 	    auto double (*z)[4] = (double (*)[4])0;
	}

In general, if you get funny error messages in connection with pointer to
function declarations use a storage class specifier to help YACC.

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