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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 --- - Missing diagnostic for return of std::unique_ptr<Derived> in C++11"
href="https://llvm.org/bugs/show_bug.cgi?id=31461">31461</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missing diagnostic for return of std::unique_ptr<Derived> in C++11
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vmpstr@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider the following
#include <memory>
struct A {};
struct B : public A {};
std::unique_ptr<A> f() {
auto result = std::unique_ptr<B>(new B);
return result;
}
In C++11, the return line has to have an std::move, since the type of |result|
doesn't match the return type of the function.
However, it compiles with current clang++
Expected:
=========
$ clang++ -std=c++11 -c test.cpp
test.cpp:8:10: error: no viable conversion from 'unique_ptr<struct B,
default_delete<struct B>>' to 'unique_ptr<struct A, default_delete<struct A>>'
return result;
^~~~~~
...
$ clang++ --version
clang version 3.9.0 (trunk 273760)
...
Actual:
=======
$ clang++ -std=c++11 -c test.cpp
$ clang++ --version
clang version 3.9.0 (trunk 274367)
...
Since C++14 does allow this to compile, I suspect that
<a href="http://reviews.llvm.org/D21619">http://reviews.llvm.org/D21619</a> inadvertently caused this.</pre>
</div>
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