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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - tuple with a reference to a temporary (C++11): static_assert: "Attempted to construct a reference element in a tuple with an rvalue""
href="http://llvm.org/bugs/show_bug.cgi?id=20855">20855</a>
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<th>Summary</th>
<td>tuple with a reference to a temporary (C++11): static_assert: "Attempted to construct a reference element in a tuple with an rvalue"
</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>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mark@chromium.org
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12993" name="attach_12993" title="Testcase">attachment 12993</a> <a href="attachment.cgi?id=12993&action=edit" title="Testcase">[details]</a></span>
Testcase
When creating a tuple that contains a reference to a temporary, this
static_assert is triggered:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/tuple:210:10:
error:
static_assert failed "Attempted to construct a reference element in a
tuple with an rvalue"
{static_assert(!is_reference<_Hp>::value ||
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This check seems overzealous. In my seemingly-valid code, the temporary in
question outlives the reference to it, and there doesn’t appear to be any
reason to restrict this.
A testcase is attached. It can be built with “clang++ -std=c++11
-stdlib=libc++”.</pre>
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