Refactor the theory specific parts of definition expansion into the theory solvers.

In the process of doing this I may have fixed some bugs or some potential bugs so there
may be some user visible results of this refactoring.

Signed-off-by: Morgan Deters <mdeters@cs.nyu.edu>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/smt/logic_request.h b/src/smt/logic_request.h
new file mode 100644
index 000000000..4985b0e65
--- /dev/null
+++ b/src/smt/logic_request.h
@@ -0,0 +1,53 @@
+/*********************                                                        */
+/*! \file logic_request.h
+ ** \verbatim
+ ** Original author: Morgan Deters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2014  New York University and The University of Iowa
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief An object to request logic widening in the running SmtEngine
+ **
+ ** An object to request logic widening in the running SmtEngine.  This
+ ** class exists as a proxy between theory code and the SmtEngine, allowing
+ ** a theory to enable another theory in the SmtEngine after initialization
+ ** (thus the usual, public setLogic() cannot be used).  This is mainly to
+ ** support features like uninterpreted divide-by-zero (to support the
+ ** partial function DIVISION), where during theory expansion, the theory
+ ** of uninterpreted functions needs to be added to the logic to support
+ ** partial functions.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__LOGIC_REQUEST_H
+#define __CVC4__LOGIC_REQUEST_H
+
+#include "expr/kind.h"
+#include "smt/smt_engine.h"
+
+namespace CVC4 {
+
+class LogicRequest {
+  /** The SmtEngine at play. */
+  SmtEngine& d_smt;
+
+public:
+  LogicRequest(SmtEngine& smt) : d_smt(smt) { }
+
+  /** Widen the logic to include the given theory. */
+  void widenLogic(theory::TheoryId id) {
+    d_smt.d_logic.getUnlockedCopy();
+    d_smt.d_logic = d_smt.d_logic.getUnlockedCopy();
+    d_smt.d_logic.enableTheory(id);
+    d_smt.d_logic.lock();
+  }
+
+};/* class LogicRequest */
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__LOGIC_REQUEST_H */