00001 /* 00002 SagaEngine library 00003 Copyright (c) 2002-2006 Skalden Studio AS 00004 00005 This software is provided 'as-is', without any express or implied 00006 warranty. In no event will the authors be held liable for any 00007 damages arising from the use of this software. 00008 00009 Permission is granted to distribute the library under the terms of the 00010 Q Public License version 1.0. Be sure to read and understand the license 00011 before using the library. It should be included here, or you may read it 00012 at http://www.trolltech.com/products/qt/licenses/licensing/qpl 00013 00014 The original version of this library can be located at: 00015 http://www.sagaengine.com/ 00016 00017 Rune Myrland 00018 rune@skalden.com 00019 */ 00020 00021 00022 #ifndef Math_hpp 00023 #define Math_hpp 00024 00025 namespace se_core { 00026 class _SeCoreExport Math { 00027 public: 00028 static short random(short max) { 00029 static short seed = 1025; 00030 seed = ~((seed + 254) * 11) / 3; 00031 return (seed < 0 ? -seed : seed) % max; 00032 } 00033 00034 static long sqrt(long v) { 00035 // Highest max that will prevent overflow 00036 long max = 0x7fff; 00037 long min = 0; 00038 while(max > min + 1) { 00039 long middle = (max + min) >> 1; 00040 if(middle * middle < v) 00041 min = middle; 00042 else 00043 max = middle; 00044 } 00045 return max; 00046 } 00047 00048 /* 00049 static size_t hashCode(size_t size, const void* ptr) { 00050 // idea is from Bjarne Stroustrup 3rd $17.6.2.3 00051 size_t res = 0; 00052 const char* p = (const char*)ptr; // reinterpret_cast 00053 while (size--) 00054 res = (res << 1) ^ *p++; 00055 return res; 00056 } 00057 */ 00058 00059 }; 00060 00061 } 00062 00063 #endif
Home Page | SagaEngine trunk (updated nightly) reference generated Sun Dec 2 20:06:12 2007 by Doxygen version 1.3.9.1.