hw-rnd.cpp
Go to the documentation of this file.00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */ 00002 /* 00003 * Main authors: 00004 * Christian Schulte <schulte@gecode.org> 00005 * 00006 * Copyright: 00007 * Christian Schulte, 2012 00008 * 00009 * Last modified: 00010 * $Date: 2012-08-30 15:16:34 +0200 (Thu, 30 Aug 2012) $ by $Author: schulte $ 00011 * $Revision: 13026 $ 00012 * 00013 * This file is part of Gecode, the generic constraint 00014 * development environment: 00015 * http://www.gecode.org 00016 * 00017 * Permission is hereby granted, free of charge, to any person obtaining 00018 * a copy of this software and associated documentation files (the 00019 * "Software"), to deal in the Software without restriction, including 00020 * without limitation the rights to use, copy, modify, merge, publish, 00021 * distribute, sublicense, and/or sell copies of the Software, and to 00022 * permit persons to whom the Software is furnished to do so, subject to 00023 * the following conditions: 00024 * 00025 * The above copyright notice and this permission notice shall be 00026 * included in all copies or substantial portions of the Software. 00027 * 00028 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 00029 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00030 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 00031 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 00032 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 00033 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 00034 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00035 * 00036 */ 00037 00038 #ifdef _MSC_VER 00039 00040 #define _CRT_RAND_S 00041 #include <stdlib.h> 00042 00043 #include <gecode/support.hh> 00044 00045 namespace Gecode { namespace Support { 00046 00047 unsigned int hwrnd(void) { 00048 unsigned int r; 00049 (void) rand_s(&r); 00050 return r; 00051 } 00052 00053 }} 00054 00055 #else 00056 00057 #include <gecode/support.hh> 00058 00059 #include <fstream> 00060 00061 namespace Gecode { namespace Support { 00062 00063 unsigned int hwrnd(void) { 00064 std::fstream devrandom; 00065 devrandom.open("/dev/random", std::fstream::in); 00066 unsigned int rnd; 00067 devrandom.read(reinterpret_cast<char*>(&rnd),sizeof(unsigned int)); 00068 devrandom.close(); 00069 return rnd; 00070 } 00071 00072 }} 00073 00074 #endif 00075 00076 // STATISTICS: support-any 00077