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102 lines
2.0 KiB
C++
102 lines
2.0 KiB
C++
/*
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* CRandomGenerator.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "CRandomGenerator.h"
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VCMI_LIB_NAMESPACE_BEGIN
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CRandomGenerator::CRandomGenerator()
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{
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resetSeed();
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}
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CRandomGenerator::CRandomGenerator(int seed)
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{
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setSeed(seed);
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}
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void CRandomGenerator::setSeed(int seed)
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{
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rand.seed(seed);
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}
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void CRandomGenerator::resetSeed()
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{
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boost::hash<std::string> stringHash;
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auto threadIdHash = stringHash(boost::lexical_cast<std::string>(boost::this_thread::get_id()));
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setSeed(static_cast<int>(threadIdHash * std::time(nullptr)));
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}
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TRandI CRandomGenerator::getIntRange(int lower, int upper)
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{
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assert(lower <= upper);
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return std::bind(TIntDist(lower, upper), std::ref(rand));
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}
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vstd::TRandI64 CRandomGenerator::getInt64Range(int64_t lower, int64_t upper)
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{
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assert(lower <= upper);
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return std::bind(TInt64Dist(lower, upper), std::ref(rand));
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}
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int CRandomGenerator::nextInt(int upper)
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{
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assert(0 <= upper);
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return getIntRange(0, upper)();
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}
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int CRandomGenerator::nextInt(int lower, int upper)
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{
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assert(lower <= upper);
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return getIntRange(lower, upper)();
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}
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int CRandomGenerator::nextInt()
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{
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return TIntDist()(rand);
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}
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vstd::TRand CRandomGenerator::getDoubleRange(double lower, double upper)
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{
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assert(lower <= upper);
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return std::bind(TRealDist(lower, upper), std::ref(rand));
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}
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double CRandomGenerator::nextDouble(double upper)
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{
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assert(0 <= upper);
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return getDoubleRange(0, upper)();
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}
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double CRandomGenerator::nextDouble(double lower, double upper)
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{
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assert(lower <= upper);
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return getDoubleRange(lower, upper)();
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}
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double CRandomGenerator::nextDouble()
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{
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return TRealDist()(rand);
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}
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CRandomGenerator & CRandomGenerator::getDefault()
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{
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static thread_local CRandomGenerator defaultRand;
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return defaultRand;
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}
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TGenerator & CRandomGenerator::getStdGenerator()
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{
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return rand;
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}
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VCMI_LIB_NAMESPACE_END
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