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    <head>
      <base href="https://llvm.org/bugs/" />
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    <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 cannot deduce the template parameter when function parameter type is reference to array and template argument is braced-init-list" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23904&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=OMh2MFoguUQ5zXtxmkmz8Ggxb8FvdPnRqvx_-Xl7dsM&s=5VTnCEF5PeR59LCd8zZuy_UZsF437Pbtqh8sWTE1d8Q&e=">23904</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Clang cannot deduce the template parameter when function parameter type is reference to array and template argument is  braced-init-list
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++11
          </td>
        </tr>

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

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

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Clang cannot deduce the template parameter when function template's parameter
type is reference to array and template argument is braced-init-list.

void f( int (&&a)[3] ) { }

template < typename T, std::size_t N >
void g( T (&&a)[N] ) { }

template < typename T, std::size_t N >
void h( const T (&a)[N] ) { }


int main()
{
    // GCC and Clang accept it
    f( {1,2,3} ) ;

    // GCC accept it
    // Clang reject it
    // couldn't infer template argument 'T'(and 'N' too) 
    g( {1,2,3} ) ;
    h( {1,2,3} ) ;
}

I think GCC is right on here so template parameters can be deduced.</pre>
        </div>
      </p>
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