Add operator MakeBagOp for constructing bags (#5209)

This PR removes subtyping rules for bags and add operator MakeBagOp similar to SingletonOp

1 files changed, 48 insertions, 0 deletions

diff --git a/src/theory/bags/make_bag_op.cpp b/src/theory/bags/make_bag_op.cpp
new file mode 100644
index 000000000..6a535afc2
--- /dev/null
+++ b/src/theory/bags/make_bag_op.cpp
@@ -0,0 +1,48 @@
+/*********************                                                        */
+/*! \file bag_op.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Mudathir Mohamed
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2020 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 a class for MK_BAG operator
+ **/
+
+#include <iostream>
+
+#include "expr/type_node.h"
+#include "make_bag_op.h"
+
+namespace CVC4 {
+
+std::ostream& operator<<(std::ostream& out, const MakeBagOp& op)
+{
+  return out << "(mkBag_op " << op.getType() << ')';
+}
+
+size_t MakeBagOpHashFunction::operator()(const MakeBagOp& op) const
+{
+  return TypeNodeHashFunction()(op.getType());
+}
+
+MakeBagOp::MakeBagOp(const TypeNode& elementType)
+    : d_type(new TypeNode(elementType))
+{
+}
+
+MakeBagOp::MakeBagOp(const MakeBagOp& op) : d_type(new TypeNode(op.getType()))
+{
+}
+
+const TypeNode& MakeBagOp::getType() const { return *d_type; }
+
+bool MakeBagOp::operator==(const MakeBagOp& op) const
+{
+  return getType() == op.getType();
+}
+
+}  // namespace CVC4