<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 --- - Unjustified vexing-parse"
   href="http://llvm.org/bugs/show_bug.cgi?id=15156">15156</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Unjustified vexing-parse
          </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>Linux
          </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>Static Analyzer
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>peter_ll@pgrz.de
          </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>clang version 3.3 (trunk 173433)
Target: x86_64-unknown-linux-gnu
Thread model: posix

Hi

Compiling the following code results in a warning.

struct C
{
    C(int) {};
};

struct D
{
    D(C) {}
};

void a(int b)
{
  D d( C(b) );
}


a.cpp:13:6: warning: parentheses were disambiguated as a function declaration
[-Wvexing-parse]
  D d( C(b) );
     ^~~~~~~~
a.cpp:13:8: note: add a pair of parentheses to declare a variable
  D d( C(b) );
       ^
       (   )
1 warning generated.


In my opinion there is no parse ambiguity because "b" names a concrete object.
I await the verdict of the language lawyers. ;)

Take care
Peter</pre>
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