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// Copyright (C) 2014 Vicente Botet
//
// 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)
#define BOOST_THREAD_VERSION 4
#include <iostream>
#include <fstream>
#include <stdio.h>
#include <boost/function.hpp>
#include <boost/make_shared.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/bind/bind.hpp>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/thread/future.hpp>
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
#define EXAMPLE_1
#define EXAMPLE_2
#define EXAMPLE_3
#define EXAMPLE_4
#define EXAMPLE_5
#define EXAMPLE_6
#define EXAMPLE_7
#else
#define EXAMPLE_1
#define EXAMPLE_2
//#define EXAMPLE_3
//#define EXAMPLE_4
//#define EXAMPLE_5
//#define EXAMPLE_6
//#define EXAMPLE_7
#endif
// Test functions
int int_no_params()
{
return 42;
}
int int_with_params(int i)
{
return i;
}
std::string string_no_params()
{
return std::string("forty two");
}
std::string string_with_params(std::string& ans)
{
return ans;
}
int main(int /*argc*/, char ** /*argv[]*/)
{
std::string ans("forty two");
#if defined EXAMPLE_1
//! Compiles and produces correct result.
{
boost::packaged_task<int()> example(int_no_params);
boost::future<int> f = example.get_future();
boost::thread task(boost::move(example));
int answer = f.get();
std::cout << "Answer to life and whatnot, in English: " << answer << std::endl;
task.join();
}
#endif
#if defined EXAMPLE_2
//! Compiles and produces correct result.
{
boost::packaged_task<std::string()> example(string_no_params);
boost::future<std::string> f = example.get_future();
boost::thread task(boost::move(example));
std::string answer = f.get();
std::cout << "string_no_params: " << answer << std::endl;
task.join();
}
#endif
#if defined EXAMPLE_3
//! Doesn't compile in C++03.
//! error: variable boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)> example has initializer but incomplete type
{
boost::packaged_task<std::string(std::string&)> example(string_with_params);
boost::future<std::string> f = example.get_future();
example(ans);
std::string answer = f.get();
std::cout << "string_with_params: " << answer << std::endl;
}
#endif
#if defined EXAMPLE_4
//! Doesn't compile in C++11
// In file included from test_9303.cpp:10:
// In file included from ../../../boost/thread.hpp:13:
// In file included from ../../../boost/thread/thread.hpp:12:
// In file included from ../../../boost/thread/thread_only.hpp:22:
// ../../../boost/thread/detail/thread.hpp:76:15: error: no matching function for call to 'invoke'
// invoke(std::move(std::get<0>(fp)), std::move(std::get<Indices>(fp))...);
// ^~~~~~
{
boost::packaged_task<std::string(std::string&)> example(string_with_params);
boost::future<std::string> f = example.get_future();
boost::thread task(boost::move(example), boost::ref(ans));
std::string answer = f.get();
std::cout << "string_with_params: " << answer << std::endl;
task.join();
}
#endif
#if defined EXAMPLE_5
//! Doesn't compile in C++03, C++11 only.
//! error: extended initializer lists only available with -std=c++11 or -std=gnu++11 [-Werror]
{
boost::packaged_task<std::string(std::string&)> example
{ boost::bind(&string_with_params, ans) };
boost::future<std::string> f = example.get_future();
boost::thread task(boost::move(example), boost::ref(ans));
std::string answer = f.get();
std::cout << "string_with_params: " << answer << std::endl;
task.join();
}
#endif
#if defined EXAMPLE_6
//! Doesn't compile in C++03, C++11 only.
// packagedTestTest.cpp:94:43: error: invalid use of incomplete type ‘class boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)>’
// packagedTestTest.cpp:95:37: error: incomplete type ‘task_t {aka boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)>}’ used in nested name specifier
// boost/thread/future.hpp:1320:11: error: declaration of ‘class boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)>’
{
//typedef boost::packaged_task<std::string(std::string&)> task_t;
typedef boost::packaged_task<std::string()> task_t;
boost::shared_ptr<task_t> example = boost::make_shared<task_t>(boost::bind(&string_with_params, boost::ref(ans)));
boost::future<std::string> f = example->get_future();
boost::thread task(boost::bind(&task_t::operator(), example));
std::string answer = f.get();
std::cout << "string_with_params: " << answer << std::endl;
task.join();
}
#endif
#if defined EXAMPLE_7
//! Doesn't compile in C++03, C++11 only.
// packagedTestTest.cpp:94:43: error: invalid use of incomplete type ‘class boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)>’
// packagedTestTest.cpp:95:37: error: incomplete type ‘task_t {aka boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)>}’ used in nested name specifier
// boost/thread/future.hpp:1320:11: error: declaration of ‘class boost::packaged_task<std::basic_string<char>(std::basic_string<char>&)>’
{
boost::asio::io_service io_service;
boost::thread_group threads;
boost::asio::io_service::work work(io_service);
for (int i = 0; i < 3; ++i)
{
threads.create_thread(boost::bind(&boost::asio::io_service::run,
&io_service));
}
typedef boost::packaged_task<std::string()> task_t;
boost::shared_ptr<task_t> example = boost::make_shared<task_t>(boost::bind(&string_with_params, ans));
boost::future<std::string> f = example->get_future();
io_service.post(boost::bind(&task_t::operator(), example));
std::string answer = f.get();
std::cout << "string_with_params: " << answer << std::endl;
threads.join_all();
}
#endif
return 0;
}
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