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