diff --git a/src/utility/numeric.hpp b/src/utility/numeric.hpp
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+++ b/src/utility/numeric.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2024,  The University of Memphis,
+ *                           Regents of the University of California,
+ *                           Arizona Board of Regents.
+ *
+ * This file is part of NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NLSR is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NLSR_NUMERIC_HPP
+#define NLSR_NUMERIC_HPP
+
+#include "common.hpp"
+
+namespace nlsr::util {
+
+/**
+ * @brief Determine whether the difference between two numbers are within epsilon.
+ * @param lhs first number.
+ * @param rhs second number.
+ * @returns true if their difference is within epsilon.
+ */
+inline bool
+diffInEpsilon(double lhs, double rhs)
+{
+  return std::abs(lhs - rhs) < std::numeric_limits<double>::epsilon();
+}
+
+} // namespace nlsr::util
+
+#endif // NLSR_NUMERIC_HPP