c++ boost::cobalt main entry points - Posted on Apr 29, 2024 - See https://www.boost.org/libs/cobalt - Logs Home - d0016

cpp boost::cobalt main entry points

c++ boost::cobalt main entry points, co_main or cobalt::run

co_main

cobalt::main co_main(int argc, char * argv[])
{
	std::cout << "Hello boost::cobalt!" << std::endl;
	co_return 0;
}

cobalt::run

main can not have coroutines;

The entry called by cobalt::run can have coroutines;

The co_main can have coroutines;

#include <boost/cobalt.hpp>
#include <iostream>

namespace cobalt = boost::cobalt;

class main_class
{
public:
	virtual ~main_class() = default;
public:
	cobalt::task<int> start()
	{
		co_await this->func();
		co_await this->fn();
		co_return 0;
	}
public:
	void speak()
	{
		std::cout << "Hello!" << std::endl;
	}
public:
	cobalt::promise<void> func()
	{
		std::cout << "1\n";
		co_return;
	}
	cobalt::task<void> fn()	// cobalt::task is the lazy version of cobalt::promise
	{
		std::cout << "2\n";
		co_return;
	}
};

int main()	// This main is global symbol.
{
	main_class main;	// This main is local symbol.
	main.speak();	// main: call global symbol; ::main: call local symbol;
	return cobalt::run(main.start());
}

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