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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - rvalue overload hides the const lvalue one?"
href="http://llvm.org/bugs/show_bug.cgi?id=16682">16682</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>rvalue overload hides the const lvalue one?
</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>
<tr>
<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>marc.glisse@normalesup.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>struct A{};
struct B{operator const A()const;};
void f(A const&);
#ifdef ERR
void f(A&&);
#endif
int main(){
B a;
f(a);
}
Compiled with clang++ -std=c++11, it is happy. If I add -DERR, clang++
complains:
l.cc:9:5: error: no viable conversion from 'B' to 'A'
f(a);
^
l.cc:1:8: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'B' to 'const A &' for 1st argument
struct A{};
^
l.cc:1:8: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'B' to 'A &&' for 1st argument
struct A{};
^
l.cc:2:10: note: candidate function
struct B{operator const A()const;};
^
l.cc:5:11: note: passing argument to parameter here
void f(A&&);
^
1 error generated.
The error message is not very helpful, and g++ accepts the code. This happens
quite easily with the standard library (list::push_front for instance).</pre>
</div>
</p>
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