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      <base href="https://bugs.llvm.org/">
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    <body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')"
   href="https://bugs.llvm.org/show_bug.cgi?id=31976">bug 31976</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>INVALID
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">CC</td>
           <td>
                
           </td>
           <td>richard-llvm@metafoo.co.uk
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')"
   href="https://bugs.llvm.org/show_bug.cgi?id=31976#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')"
   href="https://bugs.llvm.org/show_bug.cgi?id=31976">bug 31976</a>
              from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
        <pre>Instantiation of a class template specialization results in the instantiation
of the declarations, but not definitions, of members. However, for a static
data member defined within a class, the initializer *is* usually part of the
declaration (not the definition), and so it must be instantiated with the
class.

As a result, in the middle of instantiating A<int>::B<int>, your code attempts
to determine the size of that class, which is not possible because the class
has not been fully instantiated yet.

So this is a GCC bug.</pre>
        </div>
      </p>


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