cpp/io/basic ostringstream/operator=

cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator= cpp/io/basic ostringstream/operator=