missing hnf

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/muz_qe/hnf.h

@@ -0,0 +1,49 @@
+/*++
+Copyright (c) 2013 Microsoft Corporation
+
+Module Name:
+
+    hnf.h
+
+Abstract:
+
+    Horn normal form convertion.
+Author:
+
+
+Notes:
+
+    Very similar to NNF.
+
+--*/
+
+#ifndef _HNF_H_
+#define _HNF_H_
+
+#include"ast.h"
+#include"params.h"
+#include"defined_names.h"
+#include"proof_converter.h"
+
+class hnf {
+    class imp;
+    imp *  m_imp;
+public:
+    hnf(ast_manager & m);
+    ~hnf();
+    
+    void operator()(expr * n,                          // [IN] expression that should be put into Horn NF
+                    proof* p,                          // [IN] proof of n
+                    expr_ref_vector & rs,              // [OUT] resultant (conjunction) of expressions
+                    proof_ref_vector& ps               // [OUT] proofs of rs
+                    );
+
+    void cancel() { set_cancel(true); }
+    void reset_cancel() { set_cancel(false); }
+    void set_cancel(bool f);
+    void set_name(symbol const& name);    
+    void reset();
+    func_decl_ref_vector const& get_fresh_predicates();
+};
+
+#endif /* _HNF_H_ */