Reorganizing source code. Created util dir

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

src/util/prime_generator.h

@@ -0,0 +1,53 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    prime_generator.h
+
+Abstract:
+
+    Prime generator
+
+Author:
+
+    Leonardo (leonardo) 2011-12-23
+
+Notes:
+
+--*/
+#ifndef _PRIME_GENERATOR_H_
+#define _PRIME_GENERATOR_H_
+
+#include"vector.h"
+#include"z3_exception.h"
+#include"util.h"
+
+class prime_generator_exception : public default_exception {
+public:
+    prime_generator_exception(char const * msg):default_exception(msg) {}
+};
+
+/**
+   \brief Prime generator
+*/
+class prime_generator {
+    svector<uint64> m_primes;
+    void process_next_k_numbers(uint64 k);
+public:
+    prime_generator();
+    uint64 operator()(unsigned idx);
+    void finalize();
+};
+
+class prime_iterator {
+    unsigned          m_idx;
+    prime_generator * m_generator;
+    bool              m_global;
+public:
+    prime_iterator(prime_generator * g = 0);
+    uint64 next();
+    static void finalize();
+};
+
+#endif