[libc++][test] Guard non-guaranteed implicit-lifetime-ness cases with _LIBCPP_VERSION
#160627
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… `_LIBCPP_VERSION` And add some guaranteed cases to `is_implicit_lifetime.pass.cpp`.
frederick-vs-ja
added
the
libc++
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@llvm/pr-subscribers-libcxx Author: A. Jiang (frederick-vs-ja) ChangesAnd add some guaranteed cases (namely, for It's somehow unfortunate that Full diff: https://github.com/llvm/llvm-project/pull/160627.diff 1 Files Affected:
diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp
index a68f3f40e3647..6dcced8c4d000 100644
--- a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp
@@ -17,9 +17,12 @@
#include <cassert>
#include <cstddef>
+#include <expected>
+#include <optional>
#include <tuple>
#include <type_traits>
#include <utility>
+#include <variant>
#include "test_macros.h"
#include "type_algorithms.h"
@@ -216,8 +219,17 @@ constexpr bool test() {
// C++ standard library types
+ // These types are guaranteed to be implicit-lifetime.
+ test_is_implicit_lifetime<std::expected<int, float>>();
+ test_is_implicit_lifetime<std::optional<float>>();
+ test_is_implicit_lifetime<std::variant<float, int>>();
+
+#ifdef _LIBCPP_VERSION
+ // These types should be implicit-lifetime, but they are not guaranteed to be so.
+ // Especially, MSVC STL has not made them implicit-lifetime yet. See https://github.com/microsoft/STL/issues/5667.
test_is_implicit_lifetime<std::pair<int, float>>();
test_is_implicit_lifetime<std::tuple<int, float>>();
+#endif
// Standard C23 types
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philnik777
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Sep 25, 2025
libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_implicit_lifetime.pass.cpp
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philnik777
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Sep 25, 2025
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Merging as CI failures are unrelated. |
mahesh-attarde
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Oct 3, 2025
… `_LIBCPP_VERSION` (llvm#160627) And add some guaranteed cases (namely, for `expected`, `optional`, and `variant`) to `is_implicit_lifetime.pass.cpp`. It's somehow unfortunate that `pair` and `tuple` are not guaranteed to propagate triviality of copy/move constructors, and MSVC STL fails to do so due to ABI compatibility. This affects the implicit-lifetime property.
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And add some guaranteed cases (namely, for
expected,optional, andvariant) tois_implicit_lifetime.pass.cpp.It's somehow unfortunate that
pairandtupleare not guaranteed to propagate triviality of copy/move constructors, and MSVC STL fails to do so due to ABI compatibility. This affects the implicit-lifetime property.