rand_gen.cc

#include "rand_gen.h"

rand_gen::rand_gen() {
  // Generate the seed of rand gen
  generator.seed(std::chrono::system_clock::now().time_since_epoch().count());
}

rand_gen::~rand_gen() {

}

int rand_gen::irand(int LO,int HI) {
  srand(time(NULL)+rand());
  return LO + rand()%(HI);
}

float rand_gen::frand(double LO,double HI) {
  srand(time(NULL)+rand());
  return LO + static_cast <float> (rand()) /( static_cast <float> (RAND_MAX/(HI-LO)));
}

double rand_gen::exponential(double lambda) {
  // specify upperbound and lowerbound
  std::exponential_distribution<double> dist(lambda);
  // return random value
  return dist(generator);
}

int rand_gen::uniform_int(int lb,int ub){
  // specify upperbound and lowerbound
  std::uniform_int_distribution<int> dist(lb,ub);
  // return random value
  return dist(generator);
}

double rand_gen::uniform_real(double lb,double ub) {
  // specify upperbound and lowerbound
  std::uniform_real_distribution<double> dist(lb,ub);
  // return random value
  return dist(generator);
}