future.cpp
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// Copyright Oliver Kowalke 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <cstdlib>
#include <exception>
#include <functional>
#include <iostream>
#include <string>
#include <boost/fiber/all.hpp>
inline
int fn( std::string const& str, int n)
{
for ( int i = 0; i < n; ++i)
{
std::cout << i << ": " << str << std::endl;
boost::this_fiber::yield();
}
return n;
}
void start()
{
boost::fibers::future< int > fi(
boost::fibers::async(
std::bind( fn, "abc", 5) ) );
fi.wait();
std::cout << "fn() returned " << fi.get() << std::endl;
}
int main()
{
try
{
boost::fibers::fiber( start).join();
std::cout << "done." << std::endl;
return EXIT_SUCCESS;
}
catch ( std::exception const& e)
{ std::cerr << "exception: " << e.what() << std::endl; }
catch (...)
{ std::cerr << "unhandled exception" << std::endl; }
return EXIT_FAILURE;
}