[libstdc++] numeric_limits.cc check the wchar_t limits facility

[Andreas Schwab]

Peter Schmid <schmid@snake.iap.physik.tu-darmstadt.de> writes:

|> I have no idea how to check for the signedness of wchar_t since two
|> targets define it as unsigned (hpux, aix) in contrast to all others
|> and I see no way of getting access to this information in a
|> painless way.

Does this work?

#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))

Andreas.

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