1 files changed, 37 insertions, 0 deletions
diff --git a/src/lib/eval/dependency.cc b/src/lib/eval/dependency.cc
new file mode 100644
index 0000000..66e3600
--- /dev/null
+++ b/src/lib/eval/dependency.cc
@@ -0,0 +1,37 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <eval/dependency.h>
+#include <boost/pointer_cast.hpp>
+
+namespace isc {
+namespace dhcp {
+
+bool dependOnClass(const TokenPtr& token, const std::string& name) {
+    boost::shared_ptr<TokenMember> member;
+    member = boost::dynamic_pointer_cast<TokenMember>(token);
+    if (!member) {
+        return (false);
+    }
+    return (member->getClientClass() == name);
+}
+
+bool dependOnClass(const ExpressionPtr& expr, const std::string& name) {
+    if (!expr) {
+        return (false);
+    }
+    for (auto it = expr->cbegin(); it != expr->cend(); ++it) {
+        if (dependOnClass(*it, name)) {
+            return (true);
+        }
+    }
+    return (false);
+}
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace