id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12203	boost::optional<optional<T>&> broken in 1.61.0	benzejaa@…	Fernando Cacciola	"With the new specialization for boost::optional<T&>, there's one use case that's broken now...if T is itself an optional, things are broken.

Diving into optional/detail/optional_reference_spec.hpp it looks like there's some boost::enable_if statements disabling this functionality.  Presumably these statements are to differentiate from the copy constructors/assignment above (although I'm not sure why some of the other statements are similarly guarded).  However ""is_no_optional"" is too broad of a guard.

Likely something like !boost::is_same<optional<T&>, typename boost::decay<R>::type> would be a better condition...I'll try it out and update with further info."	Bugs	closed	Boost 1.63.0	optional	Boost 1.61.0	Problem	fixed