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Tested on Linux-x64. Ok for trunk and the gcc-6 branch? 2016-10-22 Ville Voutilainen <ville.voutilainen@gmail.com> Cross-port the latest resolution of LWG2756 and some bug-fixes to experimental::optional. PR libstc++/77288 PR libstdc++/77727 * include/experimental/optional (_Optional_base): Remove constructors that take a _Tp. (__is_optional_impl, __is_optional): Remove. (__converts_from_optional): New. (optional(_Up&&)): Fix constraints, call base with in_place. (optional(const optional<_Up>&)): Fix constraints, use emplace. (optional(optional<_Up>&&)): Likewise. (operator=(_Up&&)): Fix constraints. (operator=(const optional<_Up>&)): Likewise. (operator=(optional<_Up>&&)): Likewise. (emplace(_Args&&...)): Constrain. (emplace(initializer_list<_Up>, _Args&&...)): Likewise. * testsuite/experimental/optional/77288.cc: New. * testsuite/experimental/optional/assignment/5.cc: Adjust. * testsuite/experimental/optional/cons/77727.cc: New. * testsuite/experimental/optional/cons/value.cc: Adjust.
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