Z3 sources

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

lib/pool.h

@@ -0,0 +1,50 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    pool.h
+
+Abstract:
+
+    Object pool.
+
+Author:
+
+    Leonardo de Moura (leonardo) 2007-02-15.
+
+Revision History:
+
+--*/
+#ifndef _POOL_H_
+#define _POOL_H_
+
+#include"util.h"
+#include"vector.h"
+
+template<typename T>
+class pool {
+    ptr_vector<T> m_objs;
+public:
+    ~pool() {
+        std::for_each(m_objs.begin(), m_objs.end(), delete_proc<T>());
+    }
+
+    T * mk() {
+        if (m_objs.empty()) {
+            return alloc(T);
+        }
+        else {
+            T * r = m_objs.back();
+            m_objs.pop_back();
+            return r;
+        }
+    }
+    
+    void recycle(T * obj) {
+        m_objs.push_back(obj);
+    }
+};
+
+#endif /* _POOL_H_ */
+