Random.cpp File Reference

#include "Random.h"
#include "Errors.h"
#include "SFMTRand.h"
#include <memory>
#include <random>

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Functions
static SFMTRand *	GetRng ()
int32	irand (int32 min, int32 max)
uint32	urand (uint32 min, uint32 max)
uint32	urandms (uint32 min, uint32 max)
float	frand (float min, float max)
Milliseconds	randtime (Milliseconds min, Milliseconds max)
uint32	rand32 ()
double	rand_norm ()
double	rand_chance ()
uint32	urandweighted (size_t count, double const *chances)

Variables
static thread_local std::unique_ptr< SFMTRand >	sfmtRand
static RandomEngine	engine

Function Documentation

frand()

float frand	(	float	min,
		float	max
	)

Definition at line 55 of file Random.cpp.

{
 ASSERT(max >= min);
 std::uniform_real_distribution<float> urd(min, max);
 return urd(engine);
}

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GetRng()

static SFMTRand * GetRng ( )

static

Definition at line 27 of file Random.cpp.

{
 if (!sfmtRand)
 sfmtRand = std::make_unique<SFMTRand>();
 
 return sfmtRand.get();
}

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irand()

int32 irand	(	int32	min,
		int32	max
	)

Definition at line 35 of file Random.cpp.

{
 ASSERT(max >= min);
 std::uniform_int_distribution<int32> uid(min, max);
 return uid(engine);
}

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rand32()

uint32 rand32

(

)

Definition at line 70 of file Random.cpp.

{
 return GetRng()->RandomUInt32();
}

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rand_chance()

double rand_chance

(

)

Definition at line 81 of file Random.cpp.

{
 std::uniform_real_distribution<double> urd(0.0, 100.0);
 return urd(engine);
}

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rand_norm()

double rand_norm

(

)

Definition at line 75 of file Random.cpp.

{
 std::uniform_real_distribution<double> urd;
 return urd(engine);
}

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randtime()

Milliseconds randtime	(	Milliseconds	min,
		Milliseconds	max
	)

Definition at line 62 of file Random.cpp.

{
 long long diff = max.count() - min.count();
 ASSERT(diff >= 0);
 ASSERT(diff <= 0xFFFFFFFF);
 return min + Milliseconds(urand(0, uint32(diff)));
}

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urand()

uint32 urand	(	uint32	min,
		uint32	max
	)

Definition at line 42 of file Random.cpp.

{
 ASSERT(max >= min);
 std::uniform_int_distribution<uint32> uid(min, max);
 return uid(engine);
}

urandms()

uint32 urandms	(	uint32	min,
		uint32	max
	)

Definition at line 49 of file Random.cpp.

{
 ASSERT(std::numeric_limits<uint32>::max() / Milliseconds::period::den >= max);
 return urand(min * Milliseconds::period::den, max * Milliseconds::period::den);
}

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urandweighted()

uint32 urandweighted	(	size_t	count,
		double const *	chances
	)

Definition at line 87 of file Random.cpp.

{
 std::discrete_distribution<uint32> dd(chances, chances + count);
 return dd(engine);
}

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Variable Documentation

engine

RandomEngine engine

static

Definition at line 25 of file Random.cpp.

sfmtRand

thread_local std::unique_ptr<SFMTRand> sfmtRand

static

Definition at line 24 of file Random.cpp.