[util.smartptr.hash] at wrong level

[W-E-Brown]

At the moment, [util.smartptr.hash] "Smart pointer hash support" is numbered 20.8.2.6, which means it is a subclause of [util.smartptr] "Shared-ownership pointers".

However, [util.smartptr.hash] speaks to hash support for unique_ptr as well as shared_ptr.

I recommend that either:

1. [util.smartptr.hash] be repositioned to become, say, 20.8.3, or
2. the section be deleted and its two paragraphs become subclauses of their respective smart pointer sections.

[jwakely]

If it was up to me I'd move hash<unique_ptr<T,D>> under [unique.ptr] and change the title of [util.smartptr] to Shared pointer hash support. The [util.smartptr] section sounds like it covers both and so would be the right place to add hash<unique_ptr<T,D>> but [util.smartptr] is actually all about shared_ptr (and related pieces such as weak_ptr).

[zygoloid]

Decision: remove [util.smartptr] heading and move all of its contents up one level.