eis/TestProject/RNG/RandT.h

#pragma once
#include <time.h>
#include <cmath>
namespace RandT {
template <typename T>
T RandT(T _min, T _max) {
  T temp;
  if (_min > _max) {
    temp = _max;
    _max = _min;
    _min = temp;
  }
  return rand() / (double)RAND_MAX * (_max - _min) + _min;
}

double GuassRand(double mean = 0, double sigma = 0) {
  double U1 = rand() * 1.0f / RAND_MAX;  // 0~1均匀分布
  double U2 = rand() * 1.0f / RAND_MAX;  // 0~1均匀分布
  double Z =
      sqrt(-2 * log(U1)) * cos(2 * M_PI * U2);  // 均值为0，方差为1的正态分布
  double Y;
  if (sigma >= 0) {
    Y = mean + sigma * Z;
  } else {
    Y = mean + Z;
  }
  return Y;
}

bool randomBool() { return 0 + (rand() % (1 - 0 + 1)) == 1; }

}  // namespace RandT