mv util/lp to math/lp

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

src/math/lp/nra_solver.h

@@ -0,0 +1,70 @@
+/*
+  Copyright (c) 2017 Microsoft Corporation
+  Author: Nikolaj Bjorner
+*/
+
+#pragma once
+#include "util/vector.h"
+#include "math/lp/lp_settings.h"
+#include "util/rlimit.h"
+#include "util/params.h"
+#include "nlsat/nlsat_solver.h"
+
+namespace lp {
+    class lar_solver;
+}
+
+
+namespace nra {
+
+
+
+    class solver {
+        struct imp;
+        imp* m_imp;
+
+    public:
+
+        solver(lp::lar_solver& s, reslimit& lim, params_ref const& p = params_ref());
+        
+        ~solver();
+
+        /*
+          \brief Add a definition v = vs[0]*vs[1]*...*vs[sz-1]
+          The variable v is equal to the product of variables vs.
+        */
+        void add_monomial(lp::var_index v, unsigned sz, lp::var_index const* vs);
+
+        /*
+          \brief Check feasiblity of linear constraints augmented by polynomial definitions
+          that are added.
+         */
+        lbool check(lp::explanation& ex);
+
+        /*
+          \brief determine whether nra check is needed.
+        */
+        bool need_check();
+
+        /*
+          \brief Access model.
+        */
+        nlsat::anum const& value(lp::var_index v) const;
+
+        nlsat::anum_manager& am();        
+
+        /*
+          \brief push and pop scope. 
+          Monomial definitions are retraced when popping scope.
+        */
+        void push();
+        
+        void pop(unsigned n);
+
+        /*
+          \brief display state
+         */
+        std::ostream& display(std::ostream& out) const;
+
+    };
+}