<html>
    <head>
      <base href="https://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 --- - Clang allows ambiguous derived-to-base pointer conversion."
   href="https://llvm.org/bugs/show_bug.cgi?id=28195">28195</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Clang allows ambiguous derived-to-base pointer conversion.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Windows NT
          </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>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>eric@efcs.ca
          </td>
        </tr>

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

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>For example:

#include <cassert>

template <int N> struct Base { };
struct Der : Base<1>, Base<2> {};

template <int N> bool found_base(const Base<N>*)  { return true; }
bool                  found_base(...)             { return false; }

int main() { const Der d; assert(found_base(&d) == false); }

In the above example Clang selects the conversion to const Base<2>*.</pre>
        </div>
      </p>
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