Sha256: 507413dda289881472f931ad1d634767449e6cdaeb5339d1405584e113e102f4
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Size: 931 Bytes
Versions: 4
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Stored size: 931 Bytes
Contents
/* Copyright (c) 2024 Julian Benda
*
* This file is part of inkCPP which is released under MIT license.
* See file LICENSE.txt or go to
* https://github.com/JBenda/inkcpp for full license details.
*/
#pragma once
#include "system.h"
namespace ink::runtime::internal {
/**
* @brief pseudo random number generator based on Linear Congruential Generator (using glibc default values).
*/
class prng {
static constexpr uint64_t C = 12345;
static constexpr uint64_t A = 1103515245;
static constexpr uint64_t M = 1ul<<31;
public:
void srand(uint32_t seed) {
_x = seed;
}
uint32_t rand() {
_x = static_cast<uint32_t>((A*_x+ C) % M);
return _x;
}
uint32_t rand(uint32_t max) {
uint64_t prod = rand();
prod *= max;
return static_cast<int32_t>(prod / M);
}
uint32_t get_state() const { return _x; }
prng(uint32_t seed) : _x{seed}{}
prng() : prng(1337) {}
private:
uint32_t _x;
};
}
Version data entries
4 entries across 4 versions & 1 rubygems