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Subject: [Bug c++/48531] [C++0x][SFINAE] Hard errors with arrays of unknown bound
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D48531

--- Comment #11 from Daniel Kr=C3=BCgler <daniel.kruegler at googlemail dot=
 com> 2011-04-18 11:47:15 UTC ---
(In reply to comment #10)
> It is not accepted.
>=20
> I tried again to remove the special code for is_default_constructible in
> <type_traits> and a number of static_asserts, all having to do with arrays
> fired...

I was wrong, I just notice that the FDIS wording says in regard to the
expression T() in [expr.type.conv] p. 2:

"The expression T(), where T is a simple-type-specifier or typename-specifi=
er
for a non-array complete object type or the (possibly cv-qualified) void ty=
pe,
creates a prvalue of the specified type,which is value-initialized"

So, it seems that the current protection code in the library is necessary a=
s of
this wording, but I'm no longer sure that the core wording reflects the
intention, because array rvalues are clearly supported.