[cfe-dev] C++: Reference to member in sizeof expression of another member declaration
Richard Smith
richard at metafoo.co.uk
Sun May 12 16:41:37 PDT 2013
On Sun, May 12, 2013 at 1:18 AM, Florian Weimer <fweimer at redhat.com> wrote:
> clang++ (trunk, both C++03 and C++11 modes) rejects the following program:
>
> union u {
> int a;
> char b[sizeof(a)];
> };
>
> t.cpp:3:17: error: invalid use of non-static data member 'a'
> char b[sizeof(a)];
> ^
>
> This seems valid C++, considering this language in [expr.prim.general]:
> "An id-expression that denotes a non-static data member […] can only be
> used […] if that id-expression […] appears in an unevaluated operand"
Trunk accepts this for me in C++11, and rejects in C++98, which IIRC is
correct behavior.
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