<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 --- - Deriving from cl::parser<unsigned> recommended but impossible"
   href="https://llvm.org/bugs/show_bug.cgi?id=25104">25104</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Deriving from cl::parser<unsigned> recommended but impossible
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Documentation
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.7
          </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>General docs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>serge.guelton@telecom-bretagne.eu
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>In ``cl`` documentation, section _Writing a custom parser_ (see 
<a href="http://llvm.org/docs/CommandLine.html#writing-a-custom-parser">http://llvm.org/docs/CommandLine.html#writing-a-custom-parser</a>)

The following snippet appears:

```

struct FileSizeParser : public cl::parser<unsigned> {
  // parse - Return true on error.
  bool parse(cl::Option &O, StringRef ArgName, const std::string &ArgValue,
             unsigned &Val);
};

```

This is invalid, as ``cl::parser<unsigned>`` is marked as a ``final`` class.

(BTW, it seems to me that removing the final here would be nicer than updating
the doc.)</pre>
        </div>
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