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added XorShiftMask

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Ahmet Inan 2025-06-14 09:16:31 +02:00
commit d4bab41d15
1 changed files with 31 additions and 0 deletions
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31
xorshift.hh
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@ -8,6 +8,37 @@ Copyright 2018 Ahmet Inan <inan@aicodix.de>
namespace CODE { namespace CODE {
template <typename TYPE, int BITS, int FIRST, int SECOND, int THIRD, int SEED = 1>
class XorShiftMask
{
static const TYPE mask = (1 << BITS) - 1;
TYPE y_;
public:
typedef TYPE result_type;
static constexpr result_type min()
{
return 1;
}
static constexpr result_type max()
{
return mask;
}
XorShiftMask(TYPE y = SEED) : y_(y) {}
void reset(TYPE y = SEED)
{
y_ = y;
}
TYPE operator()()
{
y_ ^= y_ << FIRST;
y_ &= mask;
y_ ^= y_ >> SECOND;
y_ ^= y_ << THIRD;
y_ &= mask;
return y_;
}
};
class Xorshift32 class Xorshift32
{ {
static const uint32_t Y = 2463534242; static const uint32_t Y = 2463534242;