https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86876
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to rockeet from comment #0)
> // code:
> #include <stdio.h>
> template<class T>
> struct A {
> template<class U>
> struct X {
> void foo(U* p) { printf("p->a = %d\n", p->a); }
> };
> };
> template<class T>
> struct B {
> typedef typename A<T>::template X<B<T> > X;
> // friend typename X; // g++ fail
It's not helpful to report a compilation failure for code with the problem
commented out. You need to provide the code that produces the error.
Anyway, this is invalid. The C++ grammar says a typename-specifier must be one
of:
typename nested-name-specifier identifier
typename nested-name-specifier simple-template-id
typename nested-name-specifier template simple-template-id
As the compiler says, a nested-name-specifier is expected, and so your code is
invalid.
