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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Invalid candidate function for unary operator on scoped enum"
href="http://llvm.org/bugs/show_bug.cgi?id=19452">19452</a>
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<th>Summary</th>
<td>Invalid candidate function for unary operator on scoped enum
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>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>
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<th>Reporter</th>
<td>zilla@kayari.org
</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>Clang accepts this, recent versions of G++ reject it:
struct D
{
template <class T> D (T);
};
int operator~(const D &);
template <typename T> T &make ();
template <typename Rhs> struct H
{
static const int value = sizeof ~make<Rhs>();
};
enum class E;
int main () { return H<E>::value; }
Both clang and G++ reject:
static const int value = sizeof ~make<E>();
Whereas clang accepts (and G++ rejects) the same expression using a dependent
type:
template <typename Rhs> struct H
{
static const int value = sizeof ~make<Rhs>();
};
Clang constructs a temporary of type D and applies operator~ to that temporary.
This was first reported to <a href="http://gcc.gnu.org/PR60852">http://gcc.gnu.org/PR60852</a> but closed for the
reasons given at <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60852#c13">http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60852#c13</a> i.e.
[over.match.oper]/3, so either we're wrong or clang is :)</pre>
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