<INTERFACE> The <CD>HASH_CONS</CD> signature <SEEALSO> <STRREF>HashConsAtom</STRREF> <STRREF>HashConsMap</STRREF> <STRREF>HashConsString</STRREF> <STRREF>HashConsSet</STRREF> <FCTREF>HashConsGroundFn</FCTREF> </SEEALSO> <PP> Atoms are uniquely represented strings that support fast equality/inequality tests, as well as hashing and ordered comparisons. <SPEC> <TYPE><TYPARAM>'a<ID>tbl <SPEC> <VAL>new<TY>{eq : 'a * 'a -> bool} -> 'a tbl <SPEC> <VAL>clear<TY>'a tbl -> unit <SPEC> <TYPE><TYPARAM>'a<ID>obj<TY>{nd : 'a, tag : word, hash : word} <SPEC> <VAL>node<TY>'a obj -> 'a <SPEC> <VAL>tag<TY>'a obj -> word <SPEC> <VAL>same<TY>('a obj * 'a obj) -> bool <SPEC> <VAL>compare<TY>('a obj * 'a obj) -> order <SPEC> <VAL>cons0<TY>'a tbl -> (word * 'a) -> 'a obj <VAL>cons1<TY>'a tbl -> (word * ('b obj -> 'a)) -> 'b obj -> 'a obj <VAL>cons2<TY>'a tbl -> (word * ('b obj * 'c obj -> 'a)) -> 'b obj * 'c obj -> 'a obj <VAL>cons3<TY>'a tbl -> (word * ('b obj * 'c obj * 'd obj -> 'a)) -> 'b obj * 'c obj * 'd obj -> 'a obj <VAL>cons4<TY>'a tbl -> (word * ('b obj * 'c obj * 'd obj * 'e obj -> 'a)) -> 'b obj * 'c obj * 'd obj * 'e obj -> 'a obj <VAL>cons5<TY>'a tbl -> (word * ('b obj * 'c obj * 'd obj * 'e obj * 'f obj -> 'a)) -> 'b obj * 'c obj * 'd obj * 'e obj * 'f obj -> 'a obj <SPEC> <VAL>consList<TY>'a tbl -> (word * ('b obj list -> 'a)) -> 'b obj list -> 'a obj <SPEC> <VAL>consR1<TY>'a tbl -> (word * ('b obj -> 'a) * ('r -> 'b obj)) -> 'r -> 'a obj <VAL>consR2<TY>'a tbl -> (word * ('b obj * 'c obj -> 'a) * ('r -> 'b obj * 'c obj)) -> 'r -> 'a obj <VAL>consR3<TY>'a tbl -> (word * ('b obj * 'c obj * 'd obj -> 'a) * ('r -> 'b obj * 'c obj * 'd obj)) -> 'r -> 'a obj <VAL>consR4<TY>'a tbl -> (word * ('b obj * 'c obj * 'd obj * 'e obj -> 'a) * ('r -> 'b obj * 'c obj * 'd obj * 'e obj)) -> 'r -> 'a obj <VAL>consR5<TY>'a tbl -> (word * ('b obj * 'c obj * 'd obj * 'e obj * 'f obj -> 'a) * ('r -> 'b obj * 'c obj * 'd obj * 'e obj * 'f obj)) -> 'r -> 'a obj </INTERFACE>