https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64596
--- Comment #3 from petschy at gmail dot com --- (In reply to Daniel Krügler from comment #2) 1) if the friend declaration is invalid in line 15, then g++ should tell me so, shouldn't it? But atm it compiles it, and the surprise comes later, when the private member can't be accessed, despite the friend decl. Should I file a separate ticket about this? Any detail about why this restriction about friend and alias templates is present in the std? > > template<typename, bool> > friend class Txn; This would work, of course, but this form would give friend access to any Txn on Str, even with different E template params. That might lead to subtle bugs where invalid usage is not caught at compile time. Thanks, Peter
