1 // -*- C++ -*-
2 //===-- for_each.pass.cpp -------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9
10 // UNSUPPORTED: c++98, c++03, c++11, c++14
11
12 #include "support/pstl_test_config.h"
13
14 #include <execution>
15 #include <algorithm>
16
17 #include "support/utils.h"
18
19 using namespace TestUtils;
20
21 template <typename Type>
22 struct Gen
23 {
24 Type
operator ()Gen25 operator()(std::size_t k)
26 {
27 return Type(k % 5 != 1 ? 3 * k - 7 : 0);
28 };
29 };
30
31 template <typename T>
32 struct Flip
33 {
34 int32_t val;
FlipFlip35 Flip(int32_t y) : val(y) {}
36 T
operator ()Flip37 operator()(T& x) const
38 {
39 return x = val - x;
40 }
41 };
42
43 struct test_one_policy
44 {
45 template <typename Policy, typename Iterator, typename Size>
46 void
operator ()test_one_policy47 operator()(Policy&& exec, Iterator first, Iterator last, Iterator expected_first, Iterator expected_last, Size n)
48 {
49 typedef typename std::iterator_traits<Iterator>::value_type T;
50
51 // Try for_each
52 std::for_each(expected_first, expected_last, Flip<T>(1));
53 for_each(exec, first, last, Flip<T>(1));
54 EXPECT_EQ_N(expected_first, first, n, "wrong effect from for_each");
55
56 // Try for_each_n
57 std::for_each_n(std::execution::seq, expected_first, n, Flip<T>(1));
58 for_each_n(exec, first, n, Flip<T>(1));
59 EXPECT_EQ_N(expected_first, first, n, "wrong effect from for_each_n");
60 }
61 };
62
63 template <typename T>
64 void
test()65 test()
66 {
67 for (size_t n = 0; n <= 100000; n = n <= 16 ? n + 1 : size_t(3.1415 * n))
68 {
69 Sequence<T> inout(n, Gen<T>());
70 Sequence<T> expected(n, Gen<T>());
71 invoke_on_all_policies(test_one_policy(), inout.begin(), inout.end(), expected.begin(), expected.end(),
72 inout.size());
73 }
74 }
75
76 struct test_non_const
77 {
78 template <typename Policy, typename Iterator>
79 void
operator ()test_non_const80 operator()(Policy&& exec, Iterator iter)
81 {
82 invoke_if(exec, [&]() {
83 auto f = [](typename std::iterator_traits<Iterator>::reference x) { x = x + 1; };
84
85 for_each(exec, iter, iter, non_const(f));
86 for_each_n(exec, iter, 0, non_const(f));
87 });
88 }
89 };
90
91 int
main()92 main()
93 {
94 test<int32_t>();
95 test<uint16_t>();
96 test<float64_t>();
97
98 test_algo_basic_single<int32_t>(run_for_rnd_fw<test_non_const>());
99
100 std::cout << done() << std::endl;
101 return 0;
102 }
103