mv util/lp to math/lp

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

src/math/lp/tail_matrix.h

@@ -0,0 +1,50 @@
+/*++
+Copyright (c) 2017 Microsoft Corporation
+
+Module Name:
+
+    <name>
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Lev Nachmanson (levnach)
+
+Revision History:
+
+
+--*/
+
+#pragma once
+#include "util/vector.h"
+#include "math/lp/indexed_vector.h"
+#include "math/lp/matrix.h"
+#include "math/lp/lp_settings.h"
+// These matrices appear at the end of the list
+
+namespace lp {
+template <typename T, typename X>
+class tail_matrix
+#ifdef Z3DEBUG
+    : public matrix<T, X>
+#endif
+{
+public:
+    virtual void apply_from_left_to_T(indexed_vector<T> & w, lp_settings & settings) = 0;
+    virtual void apply_from_left(vector<X> & w, lp_settings & settings) = 0;
+    virtual void apply_from_right(vector<T> & w) = 0;
+    virtual void apply_from_right(indexed_vector<T> & w) = 0;
+    virtual ~tail_matrix() {}
+    virtual bool is_dense() const = 0;
+    struct ref_row {
+        const tail_matrix & m_A;
+        unsigned m_row;
+        ref_row(const tail_matrix& m, unsigned row): m_A(m), m_row(row) {}
+        T operator[](unsigned j) const { return m_A.get_elem(m_row, j);}
+    };
+    ref_row operator[](unsigned i) const { return ref_row(*this, i);}
+};
+}