mv util/lp to math/lp

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

src/math/lp/indexer_of_constraints.h

@@ -0,0 +1,45 @@
+/*++
+Copyright (c) 2017 Microsoft Corporation
+
+Module Name:
+
+    <name>
+
+Abstract:
+
+    <abstract>
+
+Author:
+    Nikolaj Bjorner (nbjorner)
+    Lev Nachmanson (levnach)
+
+Revision History:
+
+
+--*/
+
+#pragma once
+#include "math/lp/binary_heap_priority_queue.h"
+namespace lp {
+
+class indexer_of_constraints {
+    binary_heap_priority_queue<unsigned> m_queue_of_released_indices;
+    unsigned m_max;
+public:
+    indexer_of_constraints() :m_max(0) {}
+    unsigned get_new_index() {
+        unsigned ret;
+        if (m_queue_of_released_indices.is_empty()) {
+            ret = m_max++;
+        }
+        else {
+            ret = m_queue_of_released_indices.dequeue();
+        }
+        return ret;
+    };
+    void release_index(unsigned i) {
+        m_queue_of_released_indices.enqueue(i, i);
+    };
+    unsigned max() const { return m_max; }
+};
+}