1 // KernelUtilsOrders.h 2 // 3 // Copyright (c) 2003, Ingo Weinhold (bonefish@cs.tu-berlin.de) 4 // 5 // Permission is hereby granted, free of charge, to any person obtaining a 6 // copy of this software and associated documentation files (the "Software"), 7 // to deal in the Software without restriction, including without limitation 8 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 // and/or sell copies of the Software, and to permit persons to whom the 10 // Software is furnished to do so, subject to the following conditions: 11 // 12 // The above copyright notice and this permission notice shall be included in 13 // all copies or substantial portions of the Software. 14 // 15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 // DEALINGS IN THE SOFTWARE. 22 // 23 // Except as contained in this notice, the name of a copyright holder shall 24 // not be used in advertising or otherwise to promote the sale, use or other 25 // dealings in this Software without prior written authorization of the 26 // copyright holder. 27 28 #ifndef _KERNEL_UTILS_ORDERS_H 29 #define _KERNEL_UTILS_ORDERS_H 30 31 namespace KernelUtilsOrder { 32 33 // Ascending 34 /*! \brief A compare function object implying and ascending order. 35 36 The < operator must be defined on the template argument type. 37 */ 38 template<typename Value> 39 class Ascending { 40 public: 41 inline int operator()(const Value &a, const Value &b) const 42 { 43 if (a < b) 44 return -1; 45 else if (b < a) 46 return 1; 47 return 0; 48 } 49 }; 50 51 // Descending 52 /*! \brief A compare function object implying and descending order. 53 54 The < operator must be defined on the template argument type. 55 */ 56 template<typename Value> 57 class Descending { 58 public: 59 inline int operator()(const Value &a, const Value &b) const 60 { 61 if (a < b) 62 return -1; 63 else if (b < a) 64 return 1; 65 return 0; 66 } 67 }; 68 69 } // namespace KernelUtilsOrder 70 71 #endif // _KERNEL_UTILS_ORDERS_H 72