Template class as friend

  • Thread starter Thread starter Boni
  • Start date Start date
B

Boni

Dear all,
ist it possible to have a template class or func as friend of other class:
Folowing returns syntax errors
template< typename T> class test{};

template< typename T> int func (Ta);

class A{

friend class test;

friend int func (???);

}
 
Boni said:
Dear all,
ist it possible to have a template class or func as friend of other
class: Folowing returns syntax errors
template< typename T> class test{};

template< typename T> int func (Ta);

class A{

friend class test;

friend int func (???);

}
Click to expand...

It depends. Do you want all instantiations of the template to be friends of
A, or just a particular instantiation?

If you want all instantiations::

template <class T> friend int func(T a);
template <class T> friend class test;

If you want just a particular instantiation:

friend class test<A>; // ... or whatever instantiation you want
friend int func<A>(A a); // ... as above

-cd
 
Thanks a lot.
Carl Daniel said:
It depends. Do you want all instantiations of the template to be friends
of A, or just a particular instantiation?

If you want all instantiations::

template <class T> friend int func(T a);
template <class T> friend class test;

If you want just a particular instantiation:

friend class test<A>; // ... or whatever instantiation you want
friend int func<A>(A a); // ... as above

-cd
Click to expand...
 
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