class BOOLEAN_REF General cluster: base description: "References to objects containing a boolean value" Ancestors HASHABLE* Queries hash_code: INTEGER_32 infix "and then" (other: [like Current] BOOLEAN_REF): BOOLEAN infix "and" (other: [like Current] BOOLEAN_REF): BOOLEAN infix "implies" (other: [like Current] BOOLEAN_REF): BOOLEAN infix "or else" (other: [like Current] BOOLEAN_REF): BOOLEAN infix "or" (other: [like Current] BOOLEAN_REF): BOOLEAN infix "xor" (other: [like Current] BOOLEAN_REF): BOOLEAN is_hashable: BOOLEAN item: BOOLEAN out: STRING_8 prefix "not": [like Current] BOOLEAN_REF to_integer: INTEGER_32 to_reference: BOOLEAN_REF Commands set_item (b: BOOLEAN) Constraints involutive negation non contradiction completeness