work on propositional layer, expression builder support for large expressions, output classes, and minisat

1 files changed, 29 insertions, 0 deletions

diff --git a/src/util/decision_engine.cpp b/src/util/decision_engine.cpp
new file mode 100644
index 000000000..ae79f920d
--- /dev/null
+++ b/src/util/decision_engine.cpp
@@ -0,0 +1,29 @@
+/*********************                                           -*- C++ -*-  */
+/** decision_engine.cpp
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009 The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.
+ **
+ **/
+
+#include "util/decision_engine.h"
+#include "util/Assert.h"
+#include "util/literal.h"
+
+namespace CVC4 {
+
+DecisionEngine::~DecisionEngine() {
+}
+
+/**
+ * Only here to permit compilation and linkage.  This may be pure
+ * virtual in the final design (?)
+ */
+Literal DecisionEngine::nextDecision() {
+  Unreachable();
+}
+
+}/* CVC4 namespace */