<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Container<Incomplete Type> support"
   href="http://llvm.org/bugs/show_bug.cgi?id=17980">17980</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Container<Incomplete Type> support
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

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

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

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

        <tr>
          <th>Assignee</th>
          <td>hhinnant@apple.com
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>lichray@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Although not required by the standard (yet), allow value types
to be incomplete types can be very useful when declraing recursive
data structures:

  struct A {
    std::vector<A> v;
  };

Comparing to libstdc++, currently

  forward_list<Incomplete>

and

  deque<Incomplete>

are not supported by libc++.

Here are the proposed changes:

<a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033494.html">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033494.html</a>
<a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033517.html">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-November/033517.html</a>

The later one requires probably an ABI immigration.  We don't know what to do
yet.</pre>
        </div>
      </p>
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