1 files changed, 49 insertions, 0 deletions
diff --git a/src/lib/util/pointer_util.h b/src/lib/util/pointer_util.h
new file mode 100644
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--- /dev/null
+++ b/src/lib/util/pointer_util.h
@@ -0,0 +1,49 @@
+// Copyright (C) 2015 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/.
+
+#ifndef POINTER_UTIL_H
+#define POINTER_UTIL_H
+
+namespace isc {
+namespace util {
+
+/// @brief This function checks if two pointers are non-null and values
+/// are equal.
+///
+/// This function performs the typical comparison of values encapsulated by
+/// the smart pointers, with checking if the pointers are non-null.
+///
+/// @param ptr1 First pointer.
+/// @param ptr2 Second pointer.
+///
+/// @tparam T Pointer type, e.g. boost::shared_ptr, or boost::scoped_ptr.
+///
+/// @return true only if both pointers are non-null and the values which they
+/// point to are equal.
+template<typename T>
+inline bool equalValues(const T& ptr1, const T& ptr2) {
+    return (ptr1 && ptr2 && (*ptr1 == *ptr2));
+}
+
+/// @brief This function checks if two pointers are both null or both
+/// are non-null and they point to equal values.
+///
+/// @param ptr1 First pointer.
+/// @param ptr2 Second pointer.
+///
+/// @tparam T Pointer type, e.g. boost::shared_ptr, or boost::scoped_ptr.
+///
+/// @return true if both pointers are null or if they are both non-null
+/// and the values pointed to are equal.
+template<typename T>
+inline bool nullOrEqualValues(const T& ptr1, const T& ptr2) {
+    return ((!ptr1 && !ptr2) || equalValues(ptr1, ptr2));
+}
+
+} // end of namespace isc::util
+} // end of namespace isc
+
+#endif