id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
1232	mapped_file_source::is_open() is broken under windows	royalstream@…	Jonathan Turkanis	"Under windows, '''mapped_file_impl::handle_''' gets set to '''INVALID_HANDLE_VALUE''' when the file gets closed or on error.
But '''mapped_file_source::is_open()''' incorrectly assumes that if the handle is invalid it will have a value of zero and it doesn't consider '''INVALID_HANDLE_VALUE''' a possibility.
Obviously, adding '''INVALID_HANDLE_VALUE''' to '''mapped_file_source::is_open()''' would be poor design. A better way would be to explose a '''mapped_file_impl::is_valid()''' method that works as it should depending on the platform and have '''mapped_file_source::is_open()''' call it.

Regards,

Steven Burns"	Bugs	closed	To Be Determined	iostreams	Boost 1.34.1	Problem	fixed