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38 lines
960 B
OCaml
38 lines
960 B
OCaml
(*
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MSAT is free software, using the Apache license, see file LICENSE
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Copyright 2014 Guillaume Bury
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Copyright 2014 Simon Cruanes
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*)
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type negated =
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| Negated (* changed sign *)
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| Same_sign (* kept sign *)
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module type S = sig
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(** Signature of formulas that parametrises the SAT/SMT Solver Module. *)
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type t
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(** The type of atomic formulas. *)
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type proof
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(** An abstract type for proofs *)
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val hash : t -> int
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val equal : t -> t -> bool
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val print : Format.formatter -> t -> unit
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(** Common functions *)
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val dummy : t
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(** Formula constants. A valid formula should never be physically equal to [dummy] *)
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val neg : t -> t
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(** Formula negation *)
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val norm : t -> t * negated
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(** Returns a 'normalized' form of the formula, possibly negated
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(in which case return [Negated]).
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[norm] must be so that [a] and [neg a] normalise to the same formula,
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but one returns [Same_sign] and one returns [Negated] *)
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end
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