random.cpp

// g++ -std=c++0x random.cpp -o random

#include <iostream>
#include <random>
#include <functional>

class RandomGenerator {
private:
  std::mt19937 e_;
  std::uniform_real_distribution<long double> dist_;
public:
  RandomGenerator(long double min, long double max)
    : dist_(min, max)
  {
    std::random_device rd;
    e_.seed(rd());
  }
  
  RandomGenerator(long double min, long double max, unsigned long seed)
    : e_(seed), dist_(min, max) {}

  long double operator()() {
    return dist_(e_);
  }
};

int main(int argc, char** argv) {
  using std::cout;
  using std::endl;

  RandomGenerator gen1(0, 1);
  RandomGenerator gen2(0, 1, 0);

  for (int i=0; i<10; ++i) {
    cout << gen1() << endl;
  }

  cout << endl;

  for (int i=0; i<10; ++i) {
    cout << gen2() << endl;
  }
}