Reorganizing source code. Created util dir

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

src/util/mpbqi.h

@@ -0,0 +1,50 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    mpbqi.h
+
+Abstract:
+
+    Binary Rational Number Intervals
+
+Author:
+
+    Leonardo de Moura (leonardo) 2012-01-04
+
+Revision History:
+
+--*/
+#ifndef _MPBQI_H_
+#define _MPBQI_H_
+
+#include"mpbq.h"
+#include"basic_interval.h"
+
+class mpbqi_manager : public basic_interval_manager<mpbq_manager, false> {
+    typedef basic_interval_manager<mpbq_manager, false> super;
+public:
+    mpbqi_manager(mpbq_manager & m):super(m) {}
+
+    void set(interval & a, interval const & b) { super::set(a, b); }
+    void set(interval & a, bound const & lower, bound const & upper) { super::set(a, lower, upper); }
+    void set(interval & a, bound const & n) { super::set(a, n); }
+    void set(interval & a, mpz const & n) {
+        m().set(a.lower(), n);
+        m().set(a.upper(), n);
+    }
+
+    void add(interval const & a, interval const & b, interval & c) { super::add(a, b, c); }
+    void add(interval const & a, mpz const & b, interval & c) { 
+        m().add(a.lower(), b, c.lower());
+        m().add(a.upper(), b, c.upper());
+    }
+    
+
+};
+
+typedef mpbqi_manager::interval mpbqi;
+typedef mpbqi_manager::scoped_interval scoped_mpbqi;
+
+#endif