/*
 * Copyright 2003, Ingo Weinhold, ingo_weinhold@gmx.de.
 * All rights reserved. Distributed under the terms of the MIT license.
 */
#ifndef _KERNEL_UTILS_ORDERS_H
#define _KERNEL_UTILS_ORDERS_H

namespace KernelUtilsOrder {

// Ascending
/*!     \brief A compare function object implying and ascending order.

        The < operator must be defined on the template argument type.
*/
template<typename Value>
class Ascending {
public:
        inline int operator()(const Value &a, const Value &b) const
        {
                if (a < b)
                        return -1;
                else if (b < a)
                        return 1;
                return 0;
        }
};

// Descending
/*!     \brief A compare function object implying and descending order.

        The < operator must be defined on the template argument type.
*/
template<typename Value>
class Descending {
public:
        inline int operator()(const Value &a, const Value &b) const
        {
                if (a < b)
                        return -1;
                else if (b < a)
                        return 1;
                return 0;
        }
};

}       // namespace KernelUtilsOrder

#endif  // _KERNEL_UTILS_ORDERS_H