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C++ asynchronous process using future

Frantic Frog answered on October 2, 2022 Popularity 1/10 Helpfulness 1/10

answer C++ asynchronous process using future

C++ asynchronous process using future

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// future example
#include <iostream>       // std::cout
#include <future>         // std::async, std::future
#include <chrono>         // std::chrono::milliseconds

// a non-optimized way of checking for prime numbers:
bool is_prime (int x) {
  for (int i=2; i<x; ++i) if (x%i==0) return false;
  return true;
}

int main ()
{
  // call function asynchronously:
  std::future<bool> fut = std::async (is_prime,444444443); 

  // do something while waiting for function to set future:
  std::cout << "checking, please wait";
  std::chrono::milliseconds span (100);
  while (fut.wait_for(span)==std::future_status::timeout)
    std::cout << '.' << std::flush;

  bool x = fut.get();     // retrieve return value

  std::cout << "\n444444443 " << (x?"is":"is not") << " prime.\n";

  return 0;
}

Popularity 1/10 Helpfulness 1/10 Language cpp

Source: cplusplus.com

Tags: asynchronous c++ future process using

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Contributed on Oct 02 2022

Frantic Frog

0 Answers Avg Quality 2/10

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