In libstdc++ the deprecated char* streams are non-copyable, as was
required pre-C++11.
Since C++11 the standard implies that those streams should be copyable,
but doesn't specify the effects of copying them. This is surely a
defect, so for consistency with other implementations this change makes
them movable, but not copyable.
PR libstdc++/69608
* include/backward/strstream (strstreambuf): Define move constructor
and move assignment operator.
(istrstream, ostrstream, strstream): Likewise.
* testsuite/backward/strstream_move.cc: New.
From-SVN: r259842
c6d4257972