RNG.hh

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#pragma once
 
#include <limits>
 
namespace HEJ {
 
  struct RNG {
    using result_type = unsigned;
 
    virtual double flat() = 0;
 
    virtual result_type min() const = 0;
    virtual result_type max() const = 0;
    virtual result_type operator()() = 0;
 
    virtual ~RNG() = default;
  };
 
  struct DefaultRNG : virtual RNG {
    result_type min() const override {
      return 0U;
    }
    result_type max() const override {
      return std::numeric_limits<result_type>::max() - 1;
    }
    result_type operator()() override {
      return flat()*std::numeric_limits<result_type>::max();
    }
  };
} // namespace HEJ