flow_random_algorithm.h

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#pragma once
#include <algorithm>
#include <concepts>
#include <random>
 
namespace flow {

  template <typename T>
    requires std::integral<T> || std::floating_point<T>
  T getRandomNumber(T lower, T upper) {
    static std::random_device device{};
    static std::mt19937_64 engine(device());
    if constexpr (std::integral<T>) {
      return std::uniform_int_distribution<T>(lower, upper)(engine);
    } else {
      return std::uniform_real_distribution<T>(lower, upper)(engine);
    }
  }

  template <std::random_access_iterator It>
  void shuffle(It begin, It end) {
    static std::random_device device{};
    static std::mt19937_64 engine(device());
    std::shuffle(begin, end, engine);
  }
 
}