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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - tuple's "TupleLike" constructors behave slightly differently than standard versions"
href="https://llvm.org/bugs/show_bug.cgi?id=27375">27375</a>
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<th>Summary</th>
<td>tuple's "TupleLike" constructors behave slightly differently than standard versions
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<th>Product</th>
<td>libc++
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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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>normal
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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>eric@efcs.ca
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Libc++ implements the two standard constructors 1) 'tuple(tuple<Up...> const&)'
and 2) 'tuple(tuple<Up...>&&)' as a single generic overload 'tuple(Tuple&&)'.
This can cause a slight differences in overload resolution.
For example the call to 'tuple(tuple<...>{})' will first consider ctor #2.
However if this constructor SFINAE's aware then ctor #1 should be considered.
Since libc++ only provides a single overload it will only consider #2. This
breaks the following code:
std::tuple<int&>(std::tuple<int&&>(42));</pre>
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