RNG.hh

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#pragma once
 
#include <limits>
 
namespace HEJ {
 
  //
  // See https://en.cppreference.com/w/cpp/named_req/UniformRandomBitGenerator
  // for requirements.
  struct RNG {
    using result_type = unsigned;
 
    virtual double flat() = 0;
 
    constexpr static result_type min() {
      return 0u;
    }
 
    constexpr static result_type max() {
      return std::numeric_limits<result_type>::max() - 1;
    }
 
    result_type operator()() {
      return flat()*std::numeric_limits<result_type>::max();
    }
 
    virtual ~RNG() = default;
  };
} // namespace HEJ