pooling event with boost.asio

boost-asio-event.cpp

// prac.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <boost/asio.hpp>
#include <thread>
#include <chrono>

std::chrono::seconds getsecondsPt() {
	auto st = std::chrono::high_resolution_clock::now().time_since_epoch();
	return std::chrono::duration_cast<std::chrono::seconds>(st);
}

int main() {

	boost::asio::io_context context;

	auto run = [](boost::asio::io_context& context) {
		
		auto start = getsecondsPt();

		while (true) {
			
			auto now = getsecondsPt();

			if (now >= start + std::chrono::seconds(1)) {
				context.post([] {
					std::cout << "elapsed\n";
					});
				start = getsecondsPt();
			}

		}

	};
	
	std::thread thr(run, std::ref(context));

	auto work_guard = boost::asio::make_work_guard(context);

	context.run();
	thr.join();

}