71ade764ad
PR libstdc++/77727
* include/std/optional (optional(const optional<_Up>&)):
Default-initialize the base and use emplace.
(optional(optional<_Up>&&)): Likewise.
* testsuite/20_util/optional/cons/77727.cc: New.
From-SVN: r240511
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file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.