<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </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 - References to functions as non-type template args"
   href="https://bugs.llvm.org/show_bug.cgi?id=37829">37829</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>References to functions as non-type template args
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </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>enhancement
          </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>zhonghao@pku.org.cn
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Clang++ compiles the following code without any error messages:

#include <utility>
#include <iostream>

using namespace std;

template <typename _T, _T _V>
        void foo()
        {
                cout << __PRETTY_FUNCTION__ << endl;
        }

int a = 0;

int b() { cout << __PRETTY_FUNCTION__ << endl; }

int main()
{
        foo<int, 9>();
        foo<int (), b>();
}

In the contrast, gcc produces the following error message:
‘int()’ is not a valid type for a template non-type parameter foo<int (), b>();

A bug report of gcc (<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=6030">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=6030</a>)
discusses more details of this issue. 
Shall clang also fix the problem?</pre>
        </div>
      </p>


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