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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Relational operators for std::experimental::optional<T>"
   href="https://llvm.org/bugs/show_bug.cgi?id=31168">31168</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Relational operators for std::experimental::optional<T>
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.9
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>arthur.j.odwyer@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=17652" name="attach_17652" title="Patch for optional<T> relational operators">attachment 17652</a> <a href="attachment.cgi?id=17652&action=edit" title="Patch for optional<T> relational operators">[details]</a></span>
Patch for optional<T> relational operators

N4606 requires that optional<T>::operator> be implemented in terms of
T::operator>, but right now libc++'s optional<T>::operator> is (incorrectly)
implemented in terms of T::operator< with the operands flipped.

This is important for types T that have only incomplete orderings: (x < y) may
not imply (y > x).

I've attached a patch that I think suffices to fix the issue, but I don't have
commit privileges.</pre>
        </div>
      </p>
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