Template friends

corey taylor corey.taylor@gmail.com
Thu Feb 10 15:39:00 GMT 2005


Al,

  It would seem to me that:

template<class T> class A;
template<class T> int foobar(const A<T> &x);

template<class T> class A
{
 friend int foobar<T>(const A<T> &);
};

should work.

corey


On Wed, 09 Feb 2005 11:21:10 -0800, Al Niessner
<Al.Niessner@jpl.nasa.gov> wrote:
> 
> Ooops. The error is being thrown on the friends line. I am compiling
> a.cc whose first line is #include "a.h" which is the snippet I gave.
> Instantiation then follows some number of lines later with A<double>.
> 
> So, the whole error is:
> In file included from a.cc:1,
> a.h:29: error: `foobar' is neither function nor member function; cannot
> be declared friend
> 
> 
> On Wed, 2005-02-09 at 13:01 -0600, corey taylor wrote:
> > Al,
> >
> >   What line is this error thrown on and where are you instantiating?
> >
> > corey
> >
> >
> > On Wed, 09 Feb 2005 10:10:31 -0800, Al Niessner
> > <Al.Niessner@jpl.nasa.gov> wrote:
> > > In the previous post I mistakenly referenced my declaration as looking
> > > like h<>() in 14.5.3.2 when I should have said preempt<>() in 14.5.3.1's
> > > example. I can also change the friend the statement to be 'friend int
> > > foobar<T>(A<T> &);' and it fails with the same error.
> > >
> > > On Wed, 2005-02-09 at 09:55 -0800, Al Niessner wrote:
> > > > I figure my parser is wrong and g++ is correct, but I have no idea as to
> > > > why.
> > > >
> > > > g++ --version == 3.4.1
> > > >
> > > > Code fragment:
> > > >
> > > > template<class T> class A;
> > > > template<class T> int foobar(const A<T> &x);
> > > >
> > > > template<class T> class A
> > > > {
> > > >   ...
> > > >   friend int foobar<>(const A<T> &);
> > > >   ...
> > > > }
> > > >
> > > > gives me this:
> > > > error: `dim' is neither function nor member function; cannot be declared
> > > > friend
> > > >
> > > > So, I opened my copy of ISO 14882;2003 and read 14.5.3 and cannot find
> > > > what is wrong with my syntax. In fact, it looks similar to h<>() in the
> > > > 14.5.3.2 example. So, what is wrong with the above syntax?
> > > >
> > > --
> > > Al Niessner
> > > 818.354.0859
> > >
> > > All opinions stated above are mine and do not necessarily reflect those
> > > of JPL or NASA.
> > >
> > > --------
> > > |  dS  | >= 0
> > > --------
> > >
> > >
> --
> Al Niessner
> 818.354.0859
> 
> All opinions stated above are mine and do not necessarily reflect those
> of JPL or NASA.
> 
> --------
> |  dS  | >= 0
> --------
> 
>



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