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Make the std::get<T> overloads for rvalues use std::forward<T>(p.first) not std::move(p.first), so that lvalue reference members are not incorrectly converted to rvalues. It might appear that std::move(p).first would also work, but the language rules say that for std::pair<T&&, U> that would produce T& rather than the expected T&& (see the discussion in P2445R1 §8.2). Additional tests are added to verify all combinations of reference members, value categories, and const-qualification. libstdc++-v3/ChangeLog: PR libstdc++/121745 * include/bits/stl_pair.h (get): Use forward instead of move in std::get<T> overloads for rvalue pairs. * testsuite/20_util/pair/astuple/get_by_type.cc: Check all value categories and cv-qualification. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
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