reorganizing the code

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/math/polynomial/polynomial_cache.h

@@ -0,0 +1,44 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    polynomial_cache.h
+
+Abstract:
+
+    "Hash-consing" for polynomials
+
+Author:
+
+    Leonardo (leonardo) 2012-01-07
+
+Notes:
+
+--*/
+#ifndef _POLYNOMIAL_CACHE_H_
+#define _POLYNOMIAL_CACHE_H_
+
+#include"polynomial.h"
+
+namespace polynomial {
+
+    /**
+       \brief Functor for creating unique polynomials and caching results of operations
+    */
+    class cache {
+        struct imp;
+        imp * m_imp;
+    public:
+        cache(manager & m);
+        ~cache();
+        manager & m() const;
+        manager & pm() const { return m(); }
+        polynomial * mk_unique(polynomial * p);
+        void psc_chain(polynomial const * p, polynomial const * q, var x, polynomial_ref_vector & S);
+        void factor(polynomial const * p, polynomial_ref_vector & distinct_factors);
+        void reset();
+    };
+};
+
+#endif