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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - static_cast to rvalue reference rejected although reference binding via conversion function works"
href="http://llvm.org/bugs/show_bug.cgi?id=19917">19917</a>
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<th>Summary</th>
<td>static_cast to rvalue reference rejected although reference binding via conversion function works
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
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<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The declaration in foo() appears to satisfy the requirements in N3290 subclause
5.2.9 [expr.static.cast] paragraph 4 for the static_cast in bar() to be valid.
Clang does not seem to like the static_cast; GCC does.
### SOURCE:> cat rvRefStaticCastViaUDC.cc
struct A { };
struct B {
operator A();
} bObj;
void foo() { A &&a(bObj); }
void bar() { static_cast<A &&>(bObj); }
Return: 0x00:0
### COMPILER OUTPUT AND INVOCATION:> clang++ -std=c++11 -c
rvRefStaticCastViaUDC.cc
rvRefStaticCastViaUDC.cc:9:14: error: cannot cast from lvalue of type 'struct
B' to rvalue reference type 'A &&'; types are not compatible
void bar() { static_cast<A &&>(bObj); }
^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
Return: 0x01:1
### EXPECTED OUTPUT:> g++-4.8 -std=c++11 -c rvRefStaticCastViaUDC.cc
Return: 0x00:0
### VERSION INFO:> clang++ -v
clang version 3.4 (tags/RELEASE_34/final)
Target: powerpc64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.4
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Selected GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Return: 0x00:0</pre>
</div>
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