id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8336	fusion sequence io manipulators are thread un-safe	jeffrey.flinn@…	Joel de Guzman	"boost::detail::stream_data::attach uses a std::vector to store instances of data associated with the tuple_open, tuple_close, tuple_delimiter io manipulators. When streaming unrelated fusion sets to unrelated ostringstreams from different threads fails MSVC's debug iterator checks leading to an assert. 

Additionally the stored data items once constructed remain in memory until program exit.

The attached patch removes the static vector instance, allowing the stream to properly manage the manipulator data lifetime by using std::ios_base::register_callback. 

"	Bugs	closed	To Be Determined	fusion	Boost 1.54.0	Problem	fixed	fusion, sequence, io, manipulator, thread