blocxx
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00001 /******************************************************************************* 00002 * Copyright (C) 2005, Vintela, Inc. All rights reserved. 00003 * Copyright (C) 2006, Novell, Inc. All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions are met: 00007 * 00008 * * Redistributions of source code must retain the above copyright notice, 00009 * this list of conditions and the following disclaimer. 00010 * * Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * * Neither the name of 00014 * Vintela, Inc., 00015 * nor Novell, Inc., 00016 * nor the names of its contributors or employees may be used to 00017 * endorse or promote products derived from this software without 00018 * specific prior written permission. 00019 * 00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00021 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00022 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00023 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00024 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00025 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00026 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00029 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00030 * POSSIBILITY OF SUCH DAMAGE. 00031 *******************************************************************************/ 00032 00033 00039 #ifndef BLOCXX_RANDOMNUMBER_HPP_INCLUDE_GUARD_ 00040 #define BLOCXX_RANDOMNUMBER_HPP_INCLUDE_GUARD_ 00041 #include "blocxx/BLOCXX_config.h" 00042 #include "blocxx/Types.hpp" 00043 #include <stdlib.h> // for RAND_MAX 00044 00045 namespace BLOCXX_NAMESPACE 00046 { 00047 00048 class BLOCXX_COMMON_API RandomNumber 00049 { 00050 public: 00051 // Precondition: lowVal < highVal 00052 RandomNumber(Int32 lowVal = 0, Int32 highVal = RAND_MAX); 00053 Int32 getNextNumber(); 00054 00055 public: 00056 // This function can be called to control when the prng will be initialized. 00057 // If it hasn't been previously called, it will be called the first time a RandomNumber instance is instantiated. 00058 static void initRandomness(); 00059 static void saveRandomState(); 00060 00061 private: 00062 Int32 m_lowVal; 00063 Int32 m_highVal; 00064 }; 00065 00066 } // end namespace BLOCXX_NAMESPACE 00067 00068 #endif