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type t = private int

Some representation of literals that will be accepted by minisat. NOTE the representation used by minisat is not based on sign but parity. Do not try to encode negative literals as negative integers.

val make : int -> t

make n creates the literal whose index is n. NOTE n must be strictly positive. Use neg to obtain the negation of a literal.

val neg : t -> t

Negation of a literal. Invariant: neg (neg x) = x

val abs : t -> t

Absolute value (removes negation if any).

val sign : t -> bool

Sign: true if the literal is positive, false for a negated literal. Invariants: sign (abs x) = true sign (neg x) = not (sign x)

val to_int : t -> int
val to_string : t -> string
val pp : t printer