public static int NextInt(UniformRandomProvider generator, int bound)
{
if (bound <= 0)
{
throw new ArgumentException("bound must be strictly positive");
}
uint r = ((uint)generator.NextInt()) >> 1;
int m = bound - 1;
if ((bound & m) == 0) // i.e., bound is a power of 2
{
r = (uint)((bound * (long)r) >> 31);
}
else
{
// reject over-represented candidates
uint u = r;
while (u - (r = u % (uint)bound) + m < 0)
{
u = ((uint)generator.NextInt()) >> 1;
}
}
return((int)r);
}
public static long NextLong(UniformRandomProvider generator, long bound)
{
if (bound <= 0)
{
throw new ArgumentException("bound must be strictly positive");
}
long r = generator.NextLong();
long m = bound - 1;
if ((bound & m) == 0)
{ // i.e., bound is a power of 2
r = r & m;
}
else
{
// reject over-represented candidates
long u = r >> 1;
while (u + m - (r = u % bound) < 0L)
{
u = generator.NextLong() >> 1;
}
}
return(r);
}
public static int NextInt(UniformRandomProvider generator, int origin, int bound)
{
if (origin < bound)
{
int n = bound - origin;
if (n > 0)
{
return(generator.NextInt(n) + origin);
}
else
{ // range not representable as int
int r;
do
{
r = generator.NextInt();
} while (r < origin || r >= bound);
return(r);
}
}
else
{
return(generator.NextInt());
}
}
public static IEnumerable <bool> NextBooleans(this UniformRandomProvider generator) => Generate(generator.NextBoolean);
public static IEnumerable <bool> NextBooleans(this UniformRandomProvider generator, long streamSize) => NextBooleans(generator).TakeLong(streamSize);
public static IEnumerable <float> NextFloats(this UniformRandomProvider generator, long streamSize) => NextFloats(generator).TakeLong(streamSize);
public static IEnumerable <float> NextFloats(this UniformRandomProvider generator) => Generate(generator.NextFloat);
public static IEnumerable <long> NextLongs(this UniformRandomProvider generator, long streamSize, int origin, int bound) => NextLongs(generator, origin, bound).TakeLong(streamSize);
public static IEnumerable <long> NextLongs(this UniformRandomProvider generator, int origin, int bound) => Generate(() => generator.NextLong(bound - origin) + origin);
public static IEnumerable <long> NextLongs(this UniformRandomProvider generator) => Generate(generator.NextLong);
