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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Copy elision is not performed for objects with non overlapping lifetimes"
href="https://bugs.llvm.org/show_bug.cgi?id=46519">46519</a>
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<th>Summary</th>
<td>Copy elision is not performed for objects with non overlapping lifetimes
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<th>Product</th>
<td>clang
</td>
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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>enhancement
</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>antoshkka@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Consider the example:
struct widget {
widget();
widget(widget&&);
};
// Inspired by <a href="https://wg21.link/p2025">https://wg21.link/p2025</a>
widget test(int i) {
{
widget w1;
if (i == 1) return w1;
}
widget w2;
return w2;
}
Lifetimes of w1 and w2 do not overlap and it is possible to elide the move
constructor by constructing w1 and w2 at the same destination address.
Godbolt playground: <a href="https://godbolt.org/z/BZPgwi">https://godbolt.org/z/BZPgwi</a></pre>
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