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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __restrict qualifier not recognized in template specialization"
href="https://llvm.org/bugs/show_bug.cgi?id=27402">27402</a>
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<th>Summary</th>
<td>__restrict qualifier not recognized in template specialization
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.8
</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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>bkietz.borken@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I tried to write a trait class for detecting `__restrict` qualification on
references/pointers:
```
template <typename T>
struct is_restrict : std::false_type {};
template <typename T>
struct is_restrict<T * __restrict> : std::true_type {};
template <typename T>
struct is_restrict<T & __restrict> : std::true_type {};
template <typename T>
struct is_restrict<T && __restrict> : std::true_type {};
static_assert(is_restrict<int & __restrict>::value, "int & __restrict");
```
This static_assert passed in GCC and MSVC, but failed in Clang. The
specialization for restrict pointer functioned as expected.
<a href="http://melpon.org/wandbox/permlink/2BEkXcmEE0MmOhwl">http://melpon.org/wandbox/permlink/2BEkXcmEE0MmOhwl</a></pre>
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