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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segfault with operator '^' overload for integer_sequences when specifying wrong parameter pack"
href="https://bugs.llvm.org/show_bug.cgi?id=39231">39231</a>
</td>
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<th>Summary</th>
<td>Segfault with operator '^' overload for integer_sequences when specifying wrong parameter pack
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++14
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>niekbouman@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20980" name="attach_20980" title="Preprocessed source, associated run script and crash backtrace">attachment 20980</a> <a href="attachment.cgi?id=20980&action=edit" title="Preprocessed source, associated run script and crash backtrace">[details]</a></span>
Preprocessed source, associated run script and crash backtrace
The following code crashes.
Note the programming error, the function argument b of the overloaded operator^
takes the wrong parameter pack: A... instead of B..., which results in a
segfault on clang 7 (also tested with clang 6 and apple clang 9, where bug is
also present).
----
#include <utility>
template <typename T, T... A, T... B>
void operator^(std::integer_sequence<T, A...> a,
std::integer_sequence<T, A...> b) {
// programming error, argument b takes A... pack instead of B...
}
int main() {
using T = uint64_t;
std::integer_sequence<T, 1, 2, 3>{} ^ std::integer_sequence<T, 4, 5, 6>{};
return 0;
}</pre>
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