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Showing content from https://cplusplus.com/reference/random/linear_congruential_engine/linear_congruential_engine/ below:

public member function

<random>

explicit linear_congruential_engine ( result_type val = default_seed );

template <class Sseq>explicit linear_congruential_engine ( Sseq& q );

Construct linear congruential engine

• For version (1), the state value is set to val%modulus (unless both val and increment are multiples of modulus, in which case the state value is set to default_seed).
• For version (2), the function calls q.generate on a temporary array to construct a single value of type result_type, which is used to initialize the engine as if version (1) was called with it.

val

A seeding value.
result_type is a member type, defined as an alias of the first class template parameter (UIntType).
default_seed is a member constant, defined as 1u.

q

A seed sequence object, such as an object of type seed_seq.
Sseq shall be a seed sequence class, with a generate member function.

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// linear_congruential_engine constructor
#include <iostream>
#include <chrono>
#include <random>

int main ()
{
  // obtain a seed from the system clock:
  unsigned seed1 = std::chrono::system_clock::now().time_since_epoch().count();

  // obtain a seed from the user:
  std::string str;
  std::cout << "Please, enter a seed: ";
  std::getline(std::cin,str);
  std::seed_seq seed2 (str.begin(),str.end());

  std::minstd_rand0 g1 (seed1);  // minstd_rand0 is a standard linear_congruential_engine
  std::cout << "A time seed produced: " << g1() << std::endl;

  std::minstd_rand0 g2 (seed2);
  std::cout << "Your seed produced: " << g2() << std::endl;

  return 0;
}

Please, enter a seed: Park-Miller
A time seed produced: 1227992885
Your seed produced: 1296106123

linear_congruential_engine::seed

Seed engine (public member function)

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