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109 lines
2.8 KiB
C++
109 lines
2.8 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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logRng->trace("CRandomGenerator constructed");
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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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logRng->trace("CRandomGenerator constructed (%d)", seed);
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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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logRng->trace("CRandomGenerator::setSeed (%d)", seed);
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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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logRng->trace("CRandomGenerator::resetSeed");
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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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int CRandomGenerator::nextInt(int upper)
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{
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logRng->trace("CRandomGenerator::nextInt (%d)", upper);
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return nextInt(0, upper);
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}
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int64_t CRandomGenerator::nextInt64(int64_t upper)
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{
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logRng->trace("CRandomGenerator::nextInt64 (%d)", upper);
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return nextInt64(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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logRng->trace("CRandomGenerator::nextInt64 (%d, %d)", lower, upper);
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if (lower > upper)
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throw std::runtime_error("Invalid range provided: " + std::to_string(lower) + " ... " + std::to_string(upper));
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return TIntDist(lower, upper)(rand);
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}
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int CRandomGenerator::nextInt()
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{
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logRng->trace("CRandomGenerator::nextInt64");
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return TIntDist()(rand);
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}
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int CRandomGenerator::nextBinomialInt(int coinsCount, double coinChance)
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{
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logRng->trace("CRandomGenerator::nextBinomialInt (%d, %f)", coinsCount, coinChance);
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std::binomial_distribution<> distribution(coinsCount, coinChance);
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return distribution(rand);
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}
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int64_t CRandomGenerator::nextInt64(int64_t lower, int64_t upper)
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{
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logRng->trace("CRandomGenerator::nextInt64 (%d, %d)", lower, upper);
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if (lower > upper)
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throw std::runtime_error("Invalid range provided: " + std::to_string(lower) + " ... " + std::to_string(upper));
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return TInt64Dist(lower, upper)(rand);
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}
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double CRandomGenerator::nextDouble(double upper)
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{
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logRng->trace("CRandomGenerator::nextDouble (%f)", upper);
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return nextDouble(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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logRng->trace("CRandomGenerator::nextDouble (%f, %f)", lower, upper);
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if(lower > upper)
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throw std::runtime_error("Invalid range provided: " + std::to_string(lower) + " ... " + std::to_string(upper));
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return TRealDist(lower, upper)(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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VCMI_LIB_NAMESPACE_END
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