Global qualification in a class declarations class-head

Posted by gf on Stack Overflow See other posts from Stack Overflow or by gf
Published on 2010-05-06T13:14:34Z Indexed on 2010/05/06 13:18 UTC
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We found something similar to the following (don't ask ...):

namespace N {
    struct A { struct B; };
}

struct A { struct B; };

using namespace N;

struct ::A::B {}; // <- point of interest

Interestingly, this compiles fine with VS2005, icc 11.1 and Comeau (online), but fails with GCC:

global qualification of class name is invalid before '{' token

From C++03, Annex A, it seems to me like GCC is right:

  • the class-head can consist of nested-name-specifier and identifier
  • nested-name-specifier can't begin with a global qualification (::)
  • obviously, neither can identifier

... or am i overlooking something?

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