[Bug libstdc++/42925] Not possible to compare unique_ptr with 0

[jwakely dot gcc at gmail dot com]

------- Comment #6 from jwakely dot gcc at gmail dot com  2010-02-01 17:36 -------
(In reply to comment #5)
> Jon, is there a thread on the reflector about related issues? I spotted
> something but couldn't exactly remember...

LWG 834 is about comparing unique_ptr<T,D>::pointer to nullptr_t

LWG 1307 is about missing != comparisons for other types.

Neither is related to this issue, and I don't know of any thread on this topic.

The code would work if there was:

template<class T1, class D1>
bool operator!=(const unique_ptr<T1, D1>& x, const nullptr_t&);

(along with a version with the arguments reversed, and similarly for
operator==)

But there is no such function in the WP. Nor is there a member
unique_ptr::operator!=(nullptr_t)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42925