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Showing content from https://cplusplus.com/normal_distribution::operator() below:

public member function

<random>

template<class URNG>result_type operator()(URNG& g);

template<class URNG>result_type operator()(URNG& g, const param_type& parm);

Generate random number

The generator object (g) supplies uniformly-distributed random integers through its operator() member function. The normal_distribution object transforms the values obtained this way so that successive calls to this member function with the same arguments produce floating-point values that follow a Normal distribution with the appropriate parameters.

g

A uniform random number generator object, used as the source of randomness.
URNG shall be a uniform random number generator type, such as one of the standard generator classes.

parm

An object representing the distribution's parameters, obtained by a call to member function param.
param_type is a member type.

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// normal_distribution example
#include <iostream>
#include <chrono>
#include <random>

int main()
{
  // construct a trivial random generator engine from a time-based seed:
  unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
  std::default_random_engine generator (seed);

  std::normal_distribution<double> distribution (0.0,1.0);

  std::cout << "some Normal-distributed(0.0,1.0) results:" << std::endl;
  for (int i=0; i<10; ++i)
    std::cout << distribution(generator) << std::endl;

  return 0;
}

some Normal-distributed(0.0,1.0) results:
1.01253
-1.6811
0.722295
-1.73855
0.0196423
-2.51224
1.37467
0.999222
1.24636
2.02573

normal_distribution::param

Distribution parameters (public member function)

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