Spacer engine for HORN logic

The algorithms implemented in the engine are described in the following papers

Anvesh Komuravelli, Nikolaj Bjørner, Arie Gurfinkel, Kenneth L. McMillan:
Compositional Verification of Procedural Programs using Horn Clauses over Integers and Arrays. FMCAD 2015: 89-96

Nikolaj Bjørner, Arie Gurfinkel:
Property Directed Polyhedral Abstraction. VMCAI 2015: 263-281

Anvesh Komuravelli, Arie Gurfinkel, Sagar Chaki:
SMT-Based Model Checking for Recursive Programs. CAV 2014: 17-34

src/muz/spacer/spacer_matrix.h

@@ -0,0 +1,46 @@
+/*++
+Copyright (c) 2017 Arie Gurfinkel
+
+Module Name:
+
+    spacer_matrix.h
+
+Abstract:
+    a matrix
+
+Author:
+    Bernhard Gleiss
+
+Revision History:
+
+
+--*/
+#ifndef _SPACER_MATRIX_H_
+#define _SPACER_MATRIX_H_
+
+#include "ast.h"
+
+namespace spacer {
+
+    class spacer_matrix {
+    public:
+        spacer_matrix(unsigned m, unsigned n); // m rows, n colums
+
+        unsigned num_rows();
+        unsigned num_cols();
+
+        rational get(unsigned i, unsigned j);
+        void set(unsigned i, unsigned j, rational v);
+
+        unsigned perform_gaussian_elimination();
+
+        void print_matrix();
+        void normalize();
+    private:
+        unsigned m_num_rows;
+        unsigned m_num_cols;
+        vector<vector<rational>> m_matrix;
+    };
+}
+
+#endif