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Tested on Linux-x64. 2017-03-17 Ville Voutilainen <ville.voutilainen@gmail.com> Implement LWG 2900, The copy and move constructors of optional are not constexpr. * include/std/optional (_Optional_payload): New. (_Optional_base): Remove the bool parameter. (_Optional_base<_Tp, false>): Remove. (_Optional_base()): Adjust. (_Optional_base(nullopt_t)): Likewise. (_Optional_base(in_place_t, _Args&&...)): Likewise. (_Optional_base(in_place_t, initializer_list<_Up>, _Args&&...)): Likewise. (_Optional_base(const _Optional_base&)): Likewise. (_Optional_base(_Optional_base&&)): Likewise. (operator=(const _Optional_base&)): Likewise. (operator=(_Optional_base&&)): Likewise. (~_Optional_base()): Remove. (_M_is_engaged()): Adjust. (_M_get()): Likewise. (_M_construct(_Args&&...)): Likewise. (_M_destruct()): Likewise. (_M_reset()): Likewise. (_Optional_base::_Empty_byte): Remove. (_Optional_base::_M_empty): Remove. (_Optional_base::_M_payload): Adjust. * testsuite/20_util/optional/cons/value_neg.cc: Adjust. * testsuite/20_util/optional/constexpr/cons/value.cc: Add tests.
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