LWG issue 2247: Add type trait std::is_null_pointer

[Marshall Clow]

I think that the original proposed name "is_nullptr" was better, but here it is.

Also contains a drive-by fix so that std::is_function<const std::nullptr_t>::value is no longer true.



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-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

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