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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 --- - [C++11] overload resolution is failed even though one is more specialized than another"
href="https://llvm.org/bugs/show_bug.cgi?id=22919">22919</a>
</td>
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<th>Summary</th>
<td>[C++11] overload resolution is failed even though one is more specialized than another
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kariya_mitsuru@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14058" name="attach_14058" title="clang++ -v">attachment 14058</a> <a href="attachment.cgi?id=14058&action=edit" title="clang++ -v">[details]</a></span>
clang++ -v
The sample code below should be compiled successfully but clang 3.7.0 rejects
it as ambiguous.
============= sample code =============
template<typename T>
void f(T&) {}
template<int = 0, typename T>
void f(const T&) {}
int main()
{
const int i = 0;
f(i);
}
============= sample code =============
cf. <a href="http://melpon.org/wandbox/permlink/bYvfmOgSpFN7VD8I">http://melpon.org/wandbox/permlink/bYvfmOgSpFN7VD8I</a>
I think that the second one is more specialized.
Note that clang 3.6.0 accepts it.
cf. <a href="http://melpon.org/wandbox/permlink/YXMjSpOVkiFT6Hsn">http://melpon.org/wandbox/permlink/YXMjSpOVkiFT6Hsn</a>
Note also that clang 3.7.0 accepts it if the template parameters are swapped
like below.
============= sample code =============
template<typename T>
void f(T&) {}
template<typename T, int = 0>
void f(const T&) {}
int main()
{
const int i = 0;
f(i);
}
============= sample code =============
cf. <a href="http://melpon.org/wandbox/permlink/x3CyHr3PlwUmA1H3">http://melpon.org/wandbox/permlink/x3CyHr3PlwUmA1H3</a></pre>
</div>
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