8701cb5e0d
The __visitor_result_type helper didn't use std::invoke and so didn't compile when the visitor was a pointer-to-member rather than a function object. Use std::invoke_result instead. * include/std/variant (__variant_idx_cookie): Add member type. (__visitor_result_type): Remove. (__do_visit): Use invoke_result instead of __visitor_result_type. * testsuite/20_util/variant/visit.cc: New test. From-SVN: r270237
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