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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Implement CWG 1579: Return by converting move constructor" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23849&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=1NNWwgQVqwx59PJyAvrQ5AMGm79TKCzAuMX92YddbSQ&s=3Iu2rZWBGEzn-DJXu-pllyDw1Yxw21CU9OdMBzlpAPc&e=">23849</a>
</td>
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<th>Summary</th>
<td>Implement CWG 1579: Return by converting move constructor
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++14
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>howard.hinnant@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>New rules for implicit move on return for C++14:
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.open-2Dstd.org_jtc1_sc22_wg21_docs_cwg-5Fdefects.html-231579&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=1NNWwgQVqwx59PJyAvrQ5AMGm79TKCzAuMX92YddbSQ&s=82UdjGJ31e1j3ToP63EZkLEM4_ns6ggY2F3CEpUX2PM&e=">http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1579</a>
Here is a test to detect if the rules are implemented. This should not compile
in C++11 and should compile in C++14:
struct X
{
X() = default;
X(X&&) = default;
};
struct Y
{
Y() = default;
Y(Y&&) = default;
Y(X&&) {}
};
Y
test()
{
X x;
return x;
}
int
main()
{
auto y = test();
}</pre>
</div>
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