[v3 PATCH] Implement P0307R2, Making Optional Greater Equal Again.

[Jonathan Wakely]

On 11/07/16 23:41 +0300, Ville Voutilainen wrote:
>@@ -785,41 +785,60 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> 	}
>     };
>
>+  template<typename _Tp>
>+    using __optional_relop_t =
>+    enable_if_t<is_constructible<bool, _Tp>::value, bool>;

Should this be is_convertible<_Tp, bool> instead?

>   template<typename _Tp>
>-    constexpr bool
>+    constexpr auto
>     operator!=(const optional<_Tp>& __lhs, _Tp const& __rhs)

Dunno why this has _Tp const& rather than const _Tp&, could you fix it
while you're in the file anyway? It's a bit confusing to have one
place using a different style.