https://bugs.llvm.org/show_bug.cgi?id=39231
Bug ID: 39231
Summary: Segfault with operator '^' overload for
integer_sequences when specifying wrong parameter pack
Product: clang
Version: 7.0
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: unassignedclangb...@nondot.org
Reporter: niekbou...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 20980
--> https://bugs.llvm.org/attachment.cgi?id=20980&action=edit
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;
}
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