id summary reporter owner description type status milestone component version severity resolution keywords cc 10149 boost::optional can be constructed from a typed in place factory of the wrong type aastolfi@… Fernando Cacciola "For example: boost::optional oa = boost::in_place(0); // type-checks but results in runtime undefined behavior, placement new of double in a buffer of size char." Bugs new To Be Determined optional Boost 1.49.0 Problem