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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - lifetime-extension of conditional temporaries isn't quite right"
href="http://llvm.org/bugs/show_bug.cgi?id=18731">18731</a>
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<th>Summary</th>
<td>lifetime-extension of conditional temporaries isn't quite right
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</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>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>(See core issue 1299 for the full rules.)
Consider:
bool b;
struct S { S(int); ~S(); };
struct T { S s = 0; };
S &&r = b ? static_cast<S&&>(T().s) : static_cast<S&&>(S(2));
Here, we should lifetime-extend the T object or the S object, depending on
which arm of the conditional is selected. Currently, we lifetime-extend
neither.
While we're here, we fail to lifetime extend in this case:
using T = int[3];
//int &&r = T{}[0];
int &r = T{}[0];
... but we should. (We also reject the commented code because we classify the
array indexing as an lvalue rather than an xvalue; that's a different DR.)</pre>
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