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