[Bug c/51741] complicatet brakets wont compile
redi at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Tue Jan 3 15:25:00 GMT 2012
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51741
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-01-03 15:25:32 UTC ---
The bug reporting guidelines at http://gcc.gnu.org/bugs/ ask for the following
which you have not provided:
* the exact version of gcc
* the exact command line
* the complete preprocessed source, not some code snippets (what is pos?)
(In reply to comment #0)
> (&((knot*)((((*pos).branches)[i]).where)))
>
> (compiler sas lvaluve needed for unary & operator)
The compiler is correct. The cast to (knot*) creates an rvalue, so you cannot
take its address.
> ((knot**)(&((((*pos).branches)[i]).where)))
Here you take the address of an lvalue, then cast it to (knot**), that's legal.
> will.
> both seem like legal C to me.
No, the first one is not. The bug is in your code, not GCC.
> (((knot*)((((*pos).branches)[0]).where)).father)=pos;
>
> won't compile .
> compiler thinks I try to adress .father for something thats not a structure or
> a union. even though I castet it to a knot* before trying to adress .father.
Maybe you mean ->father not .father.
Just because your code doesn't compile, that doesn't mean it's a GCC bug.
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