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arangodb/3rdParty/boost/1.62.0/libs/context/example/v2/ontop.cpp

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// Copyright Oliver Kowalke 2014.
// 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 <iostream>
#include <tuple>
#include <boost/context/all.hpp>
namespace ctx = boost::context;
ctx::execution_context< int > f1( ctx::execution_context< int > ctx, int data) {
std::cout << "f1: entered first time: " << data << std::endl;
std::tie( ctx, data) = ctx( data + 1);
std::cout << "f1: entered second time: " << data << std::endl;
std::tie( ctx, data) = ctx( data + 1);
std::cout << "f1: entered third time: " << data << std::endl;
return ctx;
}
std::tuple< ctx::execution_context< int >, int > f2( ctx::execution_context< int > ctx, int data) {
std::cout << "f2: entered: " << data << std::endl;
return std::make_tuple( std::move( ctx), -1);
}
int main() {
int data = 0;
ctx::execution_context< int > ctx( f1);
std::tie( ctx, data) = ctx( data + 1);
std::cout << "f1: returned first time: " << data << std::endl;
std::tie( ctx, data) = ctx( data + 1);
std::cout << "f1: returned second time: " << data << std::endl;
std::tie( ctx, data) = ctx( ctx::exec_ontop_arg, f2, data + 1);
std::cout << "f1: returned third time" << std::endl;
std::cout << "main: done" << std::endl;
return EXIT_SUCCESS;
}