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When basic_stringbuf::setbuf has been called we need to copy the contents of the buffer into _M_string first, before returning that. libstdc++-v3/ChangeLog: PR libstdc++/123100 * include/std/sstream (basic_stringbuf::str()&&): Handle the case where _M_string is not being used for the buffer. * testsuite/27_io/basic_stringbuf/str/char/123100.cc: New test. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
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.