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      <base href="http://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 --- - get(tuple) and get(pair) are not constexpr, but they should be sometimes."
   href="http://llvm.org/bugs/show_bug.cgi?id=16599">16599</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>get(tuple) and get(pair) are not constexpr, but they should be sometimes.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>All
          </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>All Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>mclow.lists@gmail.com
          </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>In C++11 (N3290), get(pair) is defined as:

template<size_t I, class T1, class T2>
  typename tuple_element<I, std::pair<T1, T2> >::type&
    get(pair<T1, T2>&) noexcept;

But in the C++14 draft (N3690), it is defined as:

template<size_t I, class T1, class T2>
  constexpr typename tuple_element<I, std::pair<T1, T2> >::type&
    get(pair<T1, T2>&) noexcept;

(same for other get(pair) and get(tuple) variants)

Libc++ should mark these routines as constexpr when building for C++14.

Side note: Are there other routines like this?</pre>
        </div>
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