id summary reporter owner description type status milestone component version severity resolution keywords cc 13537 serializable unordered_map has incorrect template signature David Hawkes Robert Ramey "In boost/serialization/unordered_map.hpp the template signature looks like this: {{{ template< class Archive, class Key, class HashFcn, class EqualKey, class Allocator > }}} Whereas it should be: {{{ template< class Archive, class Key, class Type, class HashFcn, class EqualKey, class Allocator > }}} The consequence is that if a custom allocator is specified then the serialization will cause compiler errors due to there being insufficient template parameters. " Bugs new To Be Determined serialization Boost 1.67.0 Problem unordered_map serialization