Re: c++/3033: 'using typename' construct doesn't work

[sethml@ofb.net]

> sethml@ofb.net writes:
> 
> | 	C++ allows the word 'typename' after a 'using' directive.  _The C++ Pro
> gramming Language_ (third edition) [Stroustrup], section A.7 (Grammar/Declara
> tions) defines the using directive:
> | 	  using-declaration:
> | 	      "using" "typename"(opt) "::"(opt) nested-name-specifier 
> | 	      unqualified-id ";"
> 
> The C++ grammar is not context-free, you cannot deduce construct
> validity just from pure grammar productions.

OK, fine.  The question remains: is this a legal construct, or not?

Seth