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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Template argument deduction of non-type template argument is foiled by parentheses"
href="https://bugs.llvm.org/show_bug.cgi?id=39103">39103</a>
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<th>Summary</th>
<td>Template argument deduction of non-type template argument is foiled by parentheses
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arthur.j.odwyer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre><a href="https://godbolt.org/z/3cQyN9">https://godbolt.org/z/3cQyN9</a>
cat >test.cc <<EOF
template<int X> struct widget {};
template<int X> void foo(widget<(X)>) {}
void xyzzy() {
foo<42>(widget<42>{}); // OK
foo(widget<42>{}); // can't deduce X
}
EOF
clang++ -std=c++11 -c test.cc
test.cc:8:5: error: no matching function for call to 'foo'
foo(widget<42>{}); // can't deduce X
^~~
test.cc:4:22: note: candidate template ignored: couldn't infer template
argument 'X'
template<int X> void foo(widget<(X)>) {}
^
1 error generated.
GCC, ICC, and MSVC all disagree with Clang here.</pre>
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