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Showing content from https://cplusplus.com/reference/random/subtract_with_carry_engine/operator()/ below:

public member function

<random>

result_type operator()();

Generate random number

The function advances the internal state by calling its transition algorithm which applies a subtract-with-carry operation on the state sequence element.

Its generation algorithm is a direct copy of the value generated with the transition algorithm.

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// subtract_with_carry::operator()
#include <iostream>
#include <chrono>
#include <random>

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

  std::subtract_with_carry_engine<unsigned,24,10,24> generator (seed);
  std::cout << "Random value: " << generator() << std::endl;

  return 0;
}

subtract_with_carry_engine::discard

Advance internal state (public member function)

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