Reorganized the SLS code.

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/tactic/sls/sls_powers.h

@@ -0,0 +1,49 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    sls_powers.h
+
+Abstract:
+
+    Power-of-2 module for SLS
+
+Author:
+
+    Christoph (cwinter) 2012-02-29
+
+Notes:
+
+--*/
+
+#ifndef _SLS_POWERS_H_
+#define _SLS_POWERS_H_
+
+#include"mpz.h"
+
+class powers : public u_map<mpz*> {
+    unsynch_mpz_manager & m;
+public:
+    powers(unsynch_mpz_manager & m) : m(m) {}
+    ~powers() {
+        for (iterator it = begin(); it != end(); it++) {
+            m.del(*it->m_value);
+            dealloc(it->m_value);
+        }
+    }
+
+    const mpz & operator()(unsigned n) {
+        u_map<mpz*>::iterator it = find_iterator(n);
+        if (it != end())
+            return *it->m_value;
+        else {
+            mpz * new_obj = alloc(mpz);                        
+            m.mul2k(m.mk_z(1), n, *new_obj);
+            insert(n, new_obj);
+            return *new_obj;
+        }
+    }
+};  
+
+#endif