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LWG 4148 (approved in Wrocław, November 2024) makes it ill-formed to dereference a std::unique_ptr if that would return a dangling reference. That can happen with a custom pointer type and a const-qualified element_type, such that std::add_lvalue_reference_t<element_type> is a reference-to-const that could bind to a short-lived temporary. In C++26 the compiler diagnoses this as an error anyway: bits/unique_ptr.h:457:16: error: returning reference to temporary [-Wreturn-local-addr] But that can be disabled with -Wno-return-local-addr so the static_assert ensures it is enforced consistently. libstdc++-v3/ChangeLog: * include/bits/unique_ptr.h (unique_ptr::operator*): Add static_assert to check for dangling reference, as per LWG 4148. * testsuite/20_util/unique_ptr/lwg4148.cc: New test. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> |
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