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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - tuple is *still* nonconforming ;)"
href="https://llvm.org/bugs/show_bug.cgi?id=31384">31384</a>
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<th>Summary</th>
<td>tuple is *still* nonconforming ;)
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>Casey@Carter.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Changes to tuple in r289727 broke range-v3! Specifically, this program no
longer compiles:
template<class T>
struct derived : std::tuple<T> {
using std::tuple<T>::tuple;
template<class U>
operator std::tuple<U>() && {
return {};
}
};
int main() {
std::tuple<int> foo = derived<int&&>{42};
}
derived's conversion operator to std::tuple is an exact match, and should be
preferred by overload resolution to std::tuple's constructor that requires a
conversion-to-base.</pre>
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