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+/*********************                                                        */
+/*! \file predicate.h
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Representation of predicates for predicate subtyping
+ **
+ ** Simple class to represent predicates for predicate subtyping.
+ ** Instances of this class are carried as the payload of
+ ** the CONSTANT-metakinded SUBTYPE_TYPE types.
+ **/
+
+#include "cvc4_public.h"
+
+#ifndef __CVC4__PREDICATE_H
+#define __CVC4__PREDICATE_H
+
+#include "util/Assert.h"
+
+namespace CVC4 {
+
+class Predicate;
+
+std::ostream& operator<<(std::ostream& out, const Predicate& p) CVC4_PUBLIC;
+
+struct CVC4_PUBLIC PredicateHashStrategy {
+  static size_t hash(const Predicate& p);
+};/* class PredicateHashStrategy */
+
+}/* CVC4 namespace */
+
+#include "expr/expr.h"
+
+namespace CVC4 {
+
+class CVC4_PUBLIC Predicate {
+
+  Expr d_predicate;
+  Expr d_witness;
+
+public:
+
+  Predicate(Expr e, Expr w = Expr()) throw(IllegalArgumentException);
+
+  operator Expr() const;
+
+  bool operator==(const Predicate& p) const;
+
+  friend std::ostream& operator<<(std::ostream& out, const Predicate& p);
+  friend size_t PredicateHashStrategy::hash(const Predicate& p);
+
+};/* class Predicate */
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__PREDICATE_H */