--- /dev/null
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \file compare.h
+ * \brief A collection of simple compare functions.
+ * \author Mike Becker
+ * \author Olaf Wintermann
+ * \version 3.0
+ * \copyright 2-Clause BSD License
+ */
+
+#ifndef UCX_COMPARE_H
+#define UCX_COMPARE_H
+
+#include "common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Compares two integers of type int.
+ *
+ * @param i1 pointer to integer one
+ * @param i2 pointer to integer two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_int(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type long int.
+ *
+ * @param i1 pointer to long integer one
+ * @param i2 pointer to long integer two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_longint(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type long long.
+ *
+ * @param i1 pointer to long long one
+ * @param i2 pointer to long long two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_longlong(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type int16_t.
+ *
+ * @param i1 pointer to int16_t one
+ * @param i2 pointer to int16_t two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_int16(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type int32_t.
+ *
+ * @param i1 pointer to int32_t one
+ * @param i2 pointer to int32_t two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_int32(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type int64_t.
+ *
+ * @param i1 pointer to int64_t one
+ * @param i2 pointer to int64_t two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_int64(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type unsigned int.
+ *
+ * @param i1 pointer to unsigned integer one
+ * @param i2 pointer to unsigned integer two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_uint(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type unsigned long int.
+ *
+ * @param i1 pointer to unsigned long integer one
+ * @param i2 pointer to unsigned long integer two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_ulongint(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type unsigned long long.
+ *
+ * @param i1 pointer to unsigned long long one
+ * @param i2 pointer to unsigned long long two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_ulonglong(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type uint16_t.
+ *
+ * @param i1 pointer to uint16_t one
+ * @param i2 pointer to uint16_t two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_uint16(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type uint32_t.
+ *
+ * @param i1 pointer to uint32_t one
+ * @param i2 pointer to uint32_t two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_uint32(void const *i1, void const *i2);
+
+/**
+ * Compares two integers of type uint64_t.
+ *
+ * @param i1 pointer to uint64_t one
+ * @param i2 pointer to uint64_t two
+ * @return -1, if *i1 is less than *i2, 0 if both are equal,
+ * 1 if *i1 is greater than *i2
+ */
+int cx_cmp_uint64(void const *i1, void const *i2);
+
+/**
+ * Compares two real numbers of type float with precision 1e-6f.
+ *
+ * @param f1 pointer to float one
+ * @param f2 pointer to float two
+ * @return -1, if *f1 is less than *f2, 0 if both are equal,
+ * 1 if *f1 is greater than *f2
+ */
+
+int cx_cmp_float(void const *f1, void const *f2);
+
+/**
+ * Compares two real numbers of type double with precision 1e-14.
+ *
+ * @param d1 pointer to double one
+ * @param d2 pointer to double two
+ * @return -1, if *d1 is less than *d2, 0 if both are equal,
+ * 1 if *d1 is greater than *d2
+ */
+int cx_cmp_double(
+ void const *d1,
+ void const *d2
+);
+
+/**
+ * Compares the integer representation of two pointers.
+ *
+ * @param ptr1 pointer to pointer one (intptr_t const*)
+ * @param ptr2 pointer to pointer two (intptr_t const*)
+ * @return -1 if *ptr1 is less than *ptr2, 0 if both are equal,
+ * 1 if *ptr1 is greater than *ptr2
+ */
+int cx_cmp_intptr(
+ void const *ptr1,
+ void const *ptr2
+);
+
+/**
+ * Compares the unsigned integer representation of two pointers.
+ *
+ * @param ptr1 pointer to pointer one (uintptr_t const*)
+ * @param ptr2 pointer to pointer two (uintptr_t const*)
+ * @return -1 if *ptr1 is less than *ptr2, 0 if both are equal,
+ * 1 if *ptr1 is greater than *ptr2
+ */
+int cx_cmp_uintptr(
+ void const *ptr1,
+ void const *ptr2
+);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif //UCX_COMPARE_H
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