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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 - Incorrect partial specialization selected for zero-length-array type"
href="https://bugs.llvm.org/show_bug.cgi?id=49808">49808</a>
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<th>Summary</th>
<td>Incorrect partial specialization selected for zero-length-array type
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>matthewjbarichello@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Affected versions:
- trunk
- 11.0.1
- 11.0.0
- 10.0.1
- 10.0.0
- 9.0.1
- 9.0.0
- 8.0.1
- 8.0.0
- 7.1.0
- 7.0.1
- 7.0.0
- 6.0.1
- 6.0.0
- 5.0.1
- 5.0.0
- 4.0.1
- 4.0.0
Driver cmdline:
Note: For clang 4.0.1 and 4.0.0, '-std=c++1z' was substituted for '-std=c++17'
clang++ -std=c++17
Code:
#include<type_traits>
tempalte<typename>
struct A : std::false_type {};
template<typename T, auto N>
struct A<T[N]> : std::true_type {};
static_assert(A<int[0]>::value);
Expected behaviour:
The static assertion passes; the 'A<T[N]>' partial specialization should've
been selected.
Actual behaviour:
The static assertion fails; the base template is selected
Notes:
Even when adding the following partial specialization, the base template is
still, incorrectly, selected:
template<typename T>
struct A<T[0]> : std::true_type {};</pre>
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