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[libc++][jthread] LWG3788: jthread::operator=(jthread&&) postconditions are unimplementable under self-assignment #153758

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Merged
merged 1 commit into from
Aug 16, 2025
Merged

[libc++][jthread] LWG3788: jthread::operator=(jthread&&) postconditions are unimplementable under self-assignment #153758

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2 changes: 1 addition & 1 deletion libcxx/docs/Status/Cxx23Issues.csv
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Original file line number Diff line number Diff line change
Expand Up @@ -230,7 +230,7 @@
"`LWG3782 <https://wg21.link/LWG3782>`__","Should ``<math.h>`` declare ``::lerp``?","2022-11 (Kona)","|Complete|","17",""
"`LWG3784 <https://wg21.link/LWG3784>`__","std.compat should not provide ``::byte`` and its friends","2022-11 (Kona)","|Complete|","19",""
"`LWG3785 <https://wg21.link/LWG3785>`__","``ranges::to`` is over-constrained on the destination type being a range","2022-11 (Kona)","","",""
"`LWG3788 <https://wg21.link/LWG3788>`__","``jthread::operator=(jthread&&)`` postconditions are unimplementable under self-assignment","2022-11 (Kona)","","",""
"`LWG3788 <https://wg21.link/LWG3788>`__","``jthread::operator=(jthread&&)`` postconditions are unimplementable under self-assignment","2022-11 (Kona)","|Complete|","18",""
"`LWG3792 <https://wg21.link/LWG3792>`__","``__cpp_lib_constexpr_algorithms`` should also be defined in ``<utility>``","2022-11 (Kona)","|Complete|","16",""
"`LWG3795 <https://wg21.link/LWG3795>`__","Self-move-assignment of ``std::future`` and ``std::shared_future`` have unimplementable postconditions","2022-11 (Kona)","","",""
"`LWG3796 <https://wg21.link/LWG3796>`__","``movable-box`` as member should use ``default-initialization`` instead of ``copy-initialization``","2022-11 (Kona)","","",""
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9 changes: 9 additions & 0 deletions libcxx/test/std/thread/thread.jthread/assign.move.pass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -112,5 +112,14 @@ int main(int, char**) {
assert(j1.get_id() == j2Id);
}

// LWG3788: self-assignement
{
std::jthread j = support::make_test_jthread([] {});
auto oldId = j.get_id();
j = std::move(j);

assert(j.get_id() == oldId);
}

return 0;
}
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