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* doc/xml/manual/intro.xml: Document LWG 2748 status. * include/std/optional (optional<T>::swap): Use is_nothrow_swappable_v for exception specification. (swap(optional<T>&, optional<T>&)): Disable when T is not swappable. * testsuite/20_util/optional/swap/2.cc: New test. From-SVN: r242415 |
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