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* include/std/functional (__invoke_impl): New overloads. (__invoke): Replace with a single function calling __invoke_impl. (invoke): Add C++17 std::invoke. (reference_wrapper::operator()): Qualify call to __invoke. (_Mem_fn_traits_base, _Mem_fn_traits): Remove unused typedefs. (_Mem_fn_base): Remove unused typedefs and implement call operator in terms of __invoke. * include/std/future (__future_base::_Async_state_commonV2): Do not pass reference_wrapper as object argument to call_once. * include/std/type_traits (result_of): Define nested __invoke_type. Handle reference_wrapper as per LWG 2219. * testsuite/20_util/bind/ref_neg.cc: Adjust dg-error directives. * testsuite/20_util/function_objects/mem_fn/55463.cc: Remove tests using member functions of reference_wrapper. From-SVN: r229290
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