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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.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 âboost::packaged_task<std::basic_string<char>(std::basic_string<char>&)> exampleâ 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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