id summary reporter owner description type status milestone component version severity resolution keywords cc 5885 Document mistake: is_union Yuhki Ogasawara John Maddock "http://www.boost.org/doc/libs/1_47_0/libs/type_traits/doc/html/boost_typetraits/reference/is_union.html The part of examples are wrong. {{{ is_union inherits from true_type. is_union::type is the type true_type. is_union::value is an integral constant expression that evaluates to true. }}} I think the all of examples should be {{{ Examples: Given: union my_union { }; is_union inherits from true_type. is_union::type is the type true_type. is_union::value is an integral constant expression that evaluates to true. is_union::value is an integral constant expression that evaluates to false. is_union::value_type is the type bool. }}}" Bugs closed To Be Determined type_traits Boost 1.47.0 Problem fixed