Add ProofNode data structure (#4311)

This is the core data structure for proofs in the new proofs infrastructure. PfRule is a global enumeration of ids of proof nodes (analogous to Kind for Nodes).

1 files changed, 39 insertions, 0 deletions

diff --git a/src/expr/proof_rule.cpp b/src/expr/proof_rule.cpp
new file mode 100644
index 000000000..2c10e09e6
--- /dev/null
+++ b/src/expr/proof_rule.cpp
@@ -0,0 +1,39 @@
+/*********************                                                        */
+/*! \file proof_rule.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Implementation of proof rule
+ **/
+
+#include "expr/proof_rule.h"
+
+#include <iostream>
+
+namespace CVC4 {
+
+const char* toString(PfRule id)
+{
+  switch (id)
+  {
+    //================================================= Core rules
+    case PfRule::ASSUME: return "ASSUME";
+    //================================================= Unknown rule
+    case PfRule::UNKNOWN: return "UNKNOWN";
+    default: return "?";
+  }
+}
+
+std::ostream& operator<<(std::ostream& out, PfRule id)
+{
+  out << toString(id);
+  return out;
+}
+
+}  // namespace CVC4