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PR 116529 shows that std::unique_ptr<X&, D> is currently unusable because the constructor taking std::auto_ptr (which is a non-standard extension since C++17) tries to form the invalid type X&* during overload resolution. We can use the `pointer` type in the constructor constraints, instead of trying to form an invalid type. The std::auto_ptr constructor can never actually match for the case where element_type is a reference, so we just need it to produce a substitution failure instead of being ill-formed. LWG 4144 might make std::unique_ptr<X&, D> ill-formed, which would invalidate this new test. We would have to remove this test in that case. Using `pointer` in the constructor from std::auto_ptr would not be needed to support the std::unique_ptr<X&, D> case, but would not cause any harm either. libstdc++-v3/ChangeLog: PR libstdc++/116529 * include/bits/unique_ptr.h (unique_ptr(auto_ptr<U>&&)): Use pointer instead of T*. * testsuite/20_util/unique_ptr/creation/116529.cc: New test. |
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