Add skeleton for theory of bags (multisets) (#5100)

This PR adds initial headers and mostly empty source files for the theory of bags (multisets).
It acts as a basis for future commits.
It includes straightforward implementation for typing rules an enumerator for bags.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/theory/bags/solver_state.cpp b/src/theory/bags/solver_state.cpp
new file mode 100644
index 000000000..77204ae76
--- /dev/null
+++ b/src/theory/bags/solver_state.cpp
@@ -0,0 +1,35 @@
+/*********************                                                        */
+/*! \file solver_state.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 Implementation of bags state object
+ **/
+
+#include "theory/bags/solver_state.h"
+
+using namespace std;
+using namespace CVC4::kind;
+
+namespace CVC4 {
+namespace theory {
+namespace bags {
+
+SolverState::SolverState(context::Context* c,
+                         context::UserContext* u,
+                         Valuation val)
+    : TheoryState(c, u, val)
+{
+  d_true = NodeManager::currentNM()->mkConst(true);
+  d_false = NodeManager::currentNM()->mkConst(false);
+}
+
+}  // namespace bags
+}  // namespace theory
+}  // namespace CVC4