Add assumptions capability interface

Author: peterschrammel

src/solvers/prop/prop_assumption.h

@@ -0,0 +1,27 @@
+/*******************************************************************\
+
+Module: Context-based Incremental Solver Interface
+
+Author: Peter Schrammel
+
+\*******************************************************************/
+
+/// \file
+/// Context-based interface for incremental solvers
+
+#ifndef CPROVER_SOLVERS_PROP_PROP_ASSUMPTION_H
+#define CPROVER_SOLVERS_PROP_PROP_ASSUMPTION_H
+
+class prop_assumptiont
+{
+public:
+  virtual void set_frozen(literalt) = 0;
+  virtual void set_frozen(const bvt &) = 0;
+  virtual void set_assumptions(const bvt &) = 0;
+  virtual void set_all_frozen() = 0;
+  virtual bool is_in_conflict(literalt) const = 0;
+
+  virtual ~prop_assumptiont() = default;
+};
+
+#endif // CPROVER_SOLVERS_PROP_PROP_ASSUMPTION_H