Karel Zak, le Tue 10 Mar 2009 13:56:25 +0100, a écrit :
> On Tue, Mar 10, 2009 at 01:15:14PM +0100, Samuel Thibault wrote:
> > Karel Zak, le Tue 10 Mar 2009 13:09:22 +0100, a écrit :
> > > You need to use union:
> > >
> > > int wfd;
> > > union { unsigned int word; char *string; } val;
> > > val.string = nl_langinfo(_NL_TIME_WEEK_1STDAY);
> > >
> > > wfd = val.word;
> >
> > That will only work with the gcc compiler, which allows to read a union
> > field what you wrote in another.
>
> Hmm...
>
> C99, 6.5.2.3 Structure and union members
>
> 82) If the member used to access the contents of a union object is
> not the same as the member last used to store a value in the object,
> the appropriate part of the object representation of the value is
> reinterpreted as an object representation in the new type as
> described in 6.2.6 (a process sometimes called "type punning"). This
> might be a trap representation.
Uh, is that new in C99? I thought it was a well-know gcc-only
extension, or maybe it's something else that is.
Samuel
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