random.hpp

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 * Copyright (C) Akiel Aries, <akiel@akiel.org>, et al.
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#ifndef RANDOM_HPP
#define RANDOM_HPP
 
#include <chrono>
#include <cstdint>
 
#define __8MAX 127  
#define __U8MAX 255 
#define __16MAX 32767  
#define __U16MAX 65535 
#define __32MAX 2147483647L  
#define __U32MAX 4294967295U 
#define __64MAX 9223372036854775807LL    
#define __U64MAX 18446744073709551615ULL 
/*#define __PCG_STATE 0x4d595df4d0f33173
#define __PCG_MULTPLR 6364136223846793005u
#define __PCG_INCR 1442695040888963407u
*/
static uint64_t __PCG_STATE = 0x4d595df4d0f33173; // Or something seed-dependent
static uint64_t const __PCG_MULTPLR = 6364136223846793005u;
static uint64_t const __PCG_INCR =
    1442695040888963407u; // Or an arbitrary odd constant
 
namespace gpmp {
 
namespace core {
 
namespace rndm {
 
class LCG {
  public:
    using result_type = uint64_t;
 
    // Default constructor
    LCG();
 
    // Constructor with parameters similar to std::linear_congruential_engine
    LCG(uint64_t seed,
        uint64_t a = 6364136223846793005ULL,
        uint64_t c = 1442695040888963407ULL);
 
    // Function to generate a random number within a specific range
    uint64_t operator()();
 
    // Function to set the seed
    void seed(uint64_t new_seed);
 
    // Functions to retrieve parameters (optional)
    uint64_t get_multiplier() const;
    uint64_t get_increment() const;
    uint64_t get_seed() const;
 
  private:
    uint64_t state;      // State of the generator
    uint64_t multiplier; // Multiplier parameter
    uint64_t increment;  // Increment parameter
};
 
uint32_t rotr32(uint32_t x, unsigned r);
 
uint32_t pcg32(void);
 
void pcg32_init(uint64_t seed);
 
} // namespace rndm
 
} // namespace core
 
} // namespace gpmp
 
#endif