-------- Original-Nachricht --------
> Datum: Sun, 02 Aug 2009 09:03:51 -0400
> Von: John Fine <johnsfine@xxxxxxxxxxx>
> An: Michael Eager <eager@xxxxxxxxxxxx>
> CC: Martin Ettl <ettl.martin@xxxxxx>, gcc-help@xxxxxxxxxxx
> Betreff: Re: declaration order of member variables in struct
> I think Martin was asking why the usual exception to pre declaration
> doesn't apply.
> In defining a class or struct, you can normally use symbols before you
> declare them.
Exactly, this was what i was wondering. In definining a class e.g.
class A
{
public:
A():m(0){}
private:
double m;
};
The member variable m is used before its declaration. But at the example, i wrote in my first mail, this does not work.
I would be interested in why does this not work when using templates?
Best regards and many thanks
Martin
> I don't know what makes this example different.
>
> Michael Eager wrote:
> > Martin Ettl wrote:
> >>
> >> template <int N, int Low=1, int Upp=N> struct Root {
> >> static const int ret =
> >> Root<N,(down?Low:mean+1),(down?mean:Upp)>::ret;
> > ^^^^ ^^^^ ^^^^ ^^^^
> >
> > Neither down nor mean are defined before they are referenced.
> >
> > ...
> > Each symbol (variable or type) in C/C++ must be declared before it is
> > used.
> >
> >
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