1// Copyright (C) 2012 Vicente Botet
2//
3// Distributed under the Boost Software License, Version 1.0. (See accompanying
4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5
6#include <boost/config.hpp>
7#if ! defined BOOST_NO_CXX11_DECLTYPE
8#define BOOST_RESULT_OF_USE_DECLTYPE
9#endif
10
11#define BOOST_THREAD_VERSION 4
12#define BOOST_THREAD_PROVIDES_EXECUTORS
13
14#include <boost/thread/experimental/task_region.hpp>
15#include <iostream>
16
17#if ! defined BOOST_NO_CXX11_RANGE_BASED_FOR && ! defined BOOST_NO_CXX11_LAMBDAS
18
19int fib_task_region(int n)
20{
21 using boost::experimental::parallel::task_region;
22 using boost::experimental::parallel::task_region_handle;
23
24 if (n == 0) return 0;
25 if (n == 1) return 1;
26
27 int n1;
28 int n2;
29
30 task_region(f: [&](task_region_handle& trh)
31 {
32 trh.run(f: [&]
33 {
34 n1 = fib_task_region(n: n - 1);
35 });
36
37 n2 = fib_task_region(n: n - 2);
38 });
39
40 return n1 + n2;
41}
42
43#if defined BOOST_THREAD_PROVIDES_EXECUTORS
44template <class Ex>
45int fib_task_region_gen( Ex& ex, int n)
46{
47 using boost::experimental::parallel::task_region;
48 using boost::experimental::parallel::task_region_handle_gen;
49
50 if (n == 0) return 0;
51 if (n == 1) return 1;
52
53 int n1;
54 int n2;
55
56 task_region(ex, [&](task_region_handle_gen<Ex>& trh)
57 {
58 trh.run([&]
59 {
60 n1 = fib_task_region(n: n - 1);
61 });
62
63 n2 = fib_task_region(n: n - 2);
64 });
65
66 return n1 + n2;
67}
68#endif
69
70int main()
71{
72 for (int i = 0; i<10; ++i) {
73 std::cout << fib_task_region(n: i) << " ";
74 }
75 std::cout << std::endl;
76
77#if defined BOOST_THREAD_PROVIDES_EXECUTORS
78 boost::basic_thread_pool tp;
79 for (int i = 0; i<10; ++i) {
80 std::cout << fib_task_region_gen(ex&: tp,n: i) << " ";
81 }
82 std::cout << std::endl;
83#endif
84 return 0;
85}
86#else
87int main()
88{
89 return 0;
90}
91#endif
92

source code of boost/libs/thread/example/fib_task_region.cpp