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Re: A simple sample code involving templates, friends and lookup
On Jan 17, 2008 2:12 PM, Dragan Milenkovic <dragan@plusplus.co.yu> wrote:
> Richard Guenther wrote:
> [snip]
> >> template <typename T>
> >> struct Foo
> >> {
> >> template <typename Z>
> >> friend void func(const Foo &);
> >> };
> >>
> >> void check(const Foo<int> & x)
> >> {
> >> // Foo<int> weird; // uncomment this line and all works
> >>
> >> func<int>(x); // <-- ERROR
> >> }
> >>
> >>
> >> Tested with gcc 4.0 - 4.3, and all behave the same:
> >>
> >> "error: 'func' was not declared in this scope"
> >>
> >> but it works if you uncomment the weird line.
> >
> > Actually even with the weird line the program is invalid. What are
> > you trying to do? ;)
> >
> > Richard.
>
> Ok... afaik, that func should be defined on that very place where it is
> declared as friend. But could you please elaborate why it is invalid,
> since you made me start questioning my C++ knowledge... :-D
How should name-lookup find func?
Richard.