## Macro: COMMON-LISP:WITH-HASH-TABLE-ITERATOR
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> WITH-HASH-TABLE-ITERATOR ((name hash-table) &body body)
> 
> Provides a method of manually looping over the elements of a hash-table. NAME
> is bound to a generator-macro that, within the scope of the invocation,
> returns one or three values. The first value tells whether any objects remain
> in the hash table. When the first value is non-NIL, the second and third
> values are the key and the value of the next object.
> 
> Consequences are undefined if HASH-TABLE is mutated during execution of BODY,
> except for changing or removing elements corresponding to the current key. The
> applies to all threads, not just the current one -- even for synchronized
> hash-tables. If the table may be mutated by another thread during iteration,
> use eg. SB-EXT:WITH-LOCKED-HASH-TABLE to protect the WITH-HASH-TABLE-ITERATOR
> for.

### Lambda list
```cl
((sb-impl::name hash-table) &body sb-impl::body)
```