streamline pb solver interface and naming after removal of xor

src/sat/smt/pb_solver_interface.h

@@ -0,0 +1,52 @@
+/*++
+Copyright (c) 2017 Microsoft Corporation
+
+Module Name:
+
+    pb_solver_interface.h
+
+Abstract:
+ 
+    Abstract interface for a solver,
+    covers functionality exposed by the sat and lookahead solvers.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2017-01-30
+
+Revision History:
+
+--*/
+
+#pragma once 
+
+#include "sat/sat_types.h"
+#include "sat/sat_solver.h"
+#include "sat/smt/sat_smt.h"
+
+
+namespace pb {
+
+    typedef sat::literal literal;
+    typedef sat::bool_var bool_var;
+    typedef sat::literal_vector literal_vector;
+    typedef std::pair<unsigned, literal> wliteral;
+    class constraint;
+
+    class solver_interface {
+    public:
+        virtual lbool value(bool_var v) const = 0;
+        virtual lbool value(literal lit) const = 0;
+        virtual bool is_false(literal lit) const = 0;
+        virtual unsigned lvl(literal lit) const = 0;
+        virtual unsigned lvl(bool_var v) const = 0;
+        virtual bool inconsistent() const = 0;
+        virtual sat::watch_list& get_wlist(literal l) = 0;
+        virtual sat::watch_list const& get_wlist(literal l) const = 0;
+        virtual void assign(literal l, sat::justification j) = 0; 
+        virtual void set_conflict(sat::justification j, literal l) = 0;
+        virtual sat::config const& get_config() const = 0;
+        virtual void assign(constraint& c, literal lit) = 0;
+        virtual void set_conflict(constraint& c, literal lit) = 0;
+    };
+}