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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::tuple_size should be a struct"
href="https://bugs.llvm.org/show_bug.cgi?id=39871">39871</a>
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<th>Summary</th>
<td>std::tuple_size should be a struct
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ag@arvid.io
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
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<pre>Currently `std::tuple_size` is declared as `class tuple_size`. According to the
C++ standard, `tuple_size` is a `struct`
(<a href="http://eel.is/c++draft/tuple.helper#lib:tuple_size">http://eel.is/c++draft/tuple.helper#lib:tuple_size</a>).
This creates portability problems between libcxx and libstdc++, which correctly
declares it as a `struct`. Currently using either will result in
`-Wmismatched-tags`.</pre>
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