Re: friend template class

Re: friend template class

[Nathan Myers]

Christian Kueblbeck wrote:
> 
> The following piece of code does not compile:
> 
> template <class T> class Test
> {
>      friend class Friend<T>;
> };
> 
> g++ 2.7.1 compiles without warning (as well as MS Visual C++), but egcs
> says:
> 
> parse error before `<'
> 
> How else should I declare friend template class?

You need to declare Friend as a template outside Test
before you declare an instance of it as a friend inside
Test.  This compiles on egcs:

  template <class T> struct A;
  template <class T> struct B { friend struct A<T>; };

Nathan Myers
ncm@cantrip.org

Re: friend template class

[Alexandre Oliva]

Christian Kueblbeck <kue@iis.fhg.de> writes:

> template <class T> class Test { friend class Friend<T>; };

> parse error before `<'

> How else should I declare friend template class?

http://egcs.cygnus.com/faq.html#friend

-- 
Alexandre Oliva
mailto:oliva@dcc.unicamp.br mailto:oliva@gnu.org mailto:aoliva@acm.org
http://www.dcc.unicamp.br/~oliva
Universidade Estadual de Campinas, SP, Brasil

friend template class

[Christian Kueblbeck]

The following piece of code does not compile:

template <class T> class Test
{
     friend class Friend<T>;
};

g++ 2.7.1 compiles without warning (as well as MS Visual C++), but egcs
says:

parse error before `<'

How else should I declare friend template class?

Can anyone help me?