merge LRA

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/util/lp/implied_bound.h

@@ -0,0 +1,42 @@
+/*
+  Copyright (c) 2017 Microsoft Corporation
+  Author: Lev Nachmanson
+*/
+#pragma once
+#include "util/lp/lp_settings.h"
+#include "util/lp/lar_constraints.h"
+namespace lean {
+struct implied_bound {
+    mpq m_bound;
+    unsigned m_j; // the column for which the bound has been found
+    bool m_is_low_bound;
+    bool m_coeff_before_j_is_pos;
+    unsigned m_row_or_term_index;
+    bool m_strict;
+    
+    lconstraint_kind kind() const {
+        lconstraint_kind k = m_is_low_bound? GE : LE;
+        if (m_strict)
+            k = static_cast<lconstraint_kind>(k / 2);
+        return k;
+    }
+    bool operator==(const implied_bound & o) const {
+        return m_j == o.m_j && m_is_low_bound == o.m_is_low_bound && m_bound == o.m_bound &&
+            m_coeff_before_j_is_pos == o.m_coeff_before_j_is_pos &&
+            m_row_or_term_index == o.m_row_or_term_index && m_strict == o.m_strict;
+    }
+    implied_bound(){}
+    implied_bound(const mpq & a,
+                  unsigned j,
+                  bool low_bound,
+                  bool coeff_before_j_is_pos,
+                  unsigned row_or_term_index,
+                  bool strict):
+        m_bound(a),
+        m_j(j),
+        m_is_low_bound(low_bound),
+        m_coeff_before_j_is_pos(coeff_before_j_is_pos),
+        m_row_or_term_index(row_or_term_index),
+        m_strict(strict) {}
+};
+}