random.hpp

#pragma once
 
#include <cstdint>
 
#include "vipra/random/random.hpp"
#include "vipra/types/idx.hpp"
#include "vipra/types/seed.hpp"
 
#include "vipra/vipra_behaviors/definitions/dsl_types.hpp"
 
namespace VIPRA::Behaviors {
 
struct Min {
  VIPRA::f_pnt val;
};
struct Max {
  VIPRA::f_pnt val;
};
 
class DRNG {
 public:
  [[nodiscard]] static inline auto ped_random_float(VIPRA::seed seed, VIPRA::idx pedIdx,
                                                    Min min, Max max) -> VIPRA::f_pnt
  {
    std::uniform_real_distribution<VIPRA::f_pnt> distr{min.val, max.val};
    return distr(get_engine(VIPRA::seed{seed + (pedIdx * PED_MULT_VAL)}));
  }
 
 private:
  static constexpr uint64_t PED_MULT_VAL{10037};
 
  static inline auto get_engine(VIPRA::seed seed) -> VIPRA::Random::Engine&
  {
    static VIPRA::Random::Engine gen{};
    gen.reseed(seed);
    return gen;
  }
};
}  // namespace VIPRA::Behaviors