Proposed resolution:

This wording is relative to N4885.

1. Modify [memory.syn], header <memory> synopsis, as indicated:

     […]
   namespace std {
     […]
   
     template<class InputIterator, class NoThrowForwardIterator>
       NoThrowForwardIterator uninitialized_copy(InputIterator first, InputIterator last,
                                                 NoThrowForwardIterator result);
     template<class ExecutionPolicy, class InputForwardIterator, class NoThrowForwardIterator>
       NoThrowForwardIterator uninitialized_copy(ExecutionPolicy&& exec, // see [algorithms.parallel.overloads]
                                                 InputForwardIterator first, InputForwardIterator last,
                                                 NoThrowForwardIterator result);
     template<class InputIterator, class Size, class NoThrowForwardIterator>
       NoThrowForwardIterator uninitialized_copy_n(InputIterator first, Size n,
                                                   NoThrowForwardIterator result);
     template<class ExecutionPolicy, class InputForwardIterator, class Size, class NoThrowForwardIterator>
       NoThrowForwardIterator uninitialized_copy_n(ExecutionPolicy&& exec, // see [algorithms.parallel.overloads]
                                                   InputForwardIterator first, Size n,
                                                   NoThrowForwardIterator result);  
     […]
   
     template<class InputIterator, class NoThrowForwardIterator>
       NoThrowForwardIterator uninitialized_move(InputIterator first, InputIterator last,
                                                 NoThrowForwardIterator result);
     template<class ExecutionPolicy, class InputForwardIterator, class NoThrowForwardIterator>
       NoThrowForwardIterator uninitialized_move(ExecutionPolicy&& exec, // see [algorithms.parallel.overloads]
                                                 InputForwardIterator first, InputForwardIterator last,
                                                 NoThrowForwardIterator result);
     template<class InputIterator, class Size, class NoThrowForwardIterator>
       pair<InputIterator, NoThrowForwardIterator>
         uninitialized_move_n(InputIterator first, Size n, NoThrowForwardIterator result);
     template<class ExecutionPolicy, class InputForwardIterator, class Size, class NoThrowForwardIterator>
       pair<InputForwardIterator, NoThrowForwardIterator>
         uninitialized_move_n(ExecutionPolicy&& exec, // see [algorithms.parallel.overloads]
                              InputForwardIterator first, Size n, NoThrowForwardIterator result);
   
     […]
   }
   

[ 2021-06-07 Approved at June 2021 virtual plenary. Status changed: Voting → WP. ]

[ 2021-05-20; Reflector poll ]

Set status to Tentatively Ready after six votes in favour during reflector poll.

The parallel versions of uninitialized_{copy,move}{,_n} are currently depicted as accepting input iterators for their source range. Similar to the non-uninitialized versions, they should require the source range to be at least forward.