libstdc++-v3/testsuite/25_algorithms/pstl/alg_merge/merge.cc

   1 // -*- C++ -*-
   2 // { dg-options "-ltbb" }
   3 // { dg-do run { target c++17 } }
   4 // { dg-timeout-factor 3 }
   5 // { dg-require-effective-target tbb_backend }
   6
   7 //===-- merge.pass.cpp ----------------------------------------------------===//
   8 //
   9 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  10 // See https://llvm.org/LICENSE.txt for license information.
  11 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "pstl/pstl_test_config.h"
  16
  17 #ifdef PSTL_STANDALONE_TESTS
  18 #include <algorithm>
  19 #include <functional>
  20 #include "pstl/execution"
  21 #include "pstl/algorithm"
  22
  23 #else
  24 #include <execution>
  25 #include <algorithm>
  26 #include <functional>
  27 #endif // PSTL_STANDALONE_TESTS
  28
  29 #include "pstl/test_utils.h"
  30
  31 using namespace TestUtils;
  32
  33 struct test_merge
  34 {
  35     template <typename Policy, typename InputIterator1, typename InputIterator2, typename OutputIterator,
  36               typename Compare>
  37     void
  38     operator()(Policy&& exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2,
  39                OutputIterator out_first, OutputIterator out_last, Compare comp)
  40     {
  41         using namespace std;
  42         {
  43             const auto res = merge(exec, first1, last1, first2, last2, out_first, comp);
  44             EXPECT_TRUE(res == out_last, "wrong return result from merge with predicate");
  45             EXPECT_TRUE(is_sorted(out_first, res, comp), "wrong result from merge with predicate");
  46             EXPECT_TRUE(includes(out_first, res, first1, last1, comp), "first sequence is not a part of result");
  47             EXPECT_TRUE(includes(out_first, res, first2, last2, comp), "second sequence is not a part of result");
  48         }
  49         {
  50             const auto res = merge(exec, first1, last1, first2, last2, out_first);
  51             EXPECT_TRUE(res == out_last, "wrong return result from merge");
  52             EXPECT_TRUE(is_sorted(out_first, res), "wrong result from merge");
  53         }
  54     }
  55
  56     // for reverse iterators
  57     template <typename Policy, typename InputIterator1, typename InputIterator2, typename OutputIterator,
  58               typename Compare>
  59     void
  60     operator()(Policy&& exec, std::reverse_iterator<InputIterator1> first1, std::reverse_iterator<InputIterator1> last1,
  61                std::reverse_iterator<InputIterator2> first2, std::reverse_iterator<InputIterator2> last2,
  62                std::reverse_iterator<OutputIterator> out_first, std::reverse_iterator<OutputIterator> out_last, Compare)
  63     {
  64         using namespace std;
  65         typedef typename std::iterator_traits<std::reverse_iterator<InputIterator1>>::value_type T;
  66         const auto res = merge(exec, first1, last1, first2, last2, out_first, std::greater<T>());
  67
  68         EXPECT_TRUE(res == out_last, "wrong return result from merge with predicate");
  69         EXPECT_TRUE(is_sorted(out_first, res, std::greater<T>()), "wrong result from merge with predicate");
  70         EXPECT_TRUE(includes(out_first, res, first1, last1, std::greater<T>()),
  71                     "first sequence is not a part of result");
  72         EXPECT_TRUE(includes(out_first, res, first2, last2, std::greater<T>()),
  73                     "second sequence is not a part of result");
  74     }
  75 };
  76
  77 template <typename T, typename Generator1, typename Generator2>
  78 void
  79 test_merge_by_type(Generator1 generator1, Generator2 generator2)
  80 {
  81     using namespace std;
  82     size_t max_size = 100000;
  83     Sequence<T> in1(max_size, generator1);
  84     Sequence<T> in2(max_size / 2, generator2);
  85     Sequence<T> out(in1.size() + in2.size());
  86     std::sort(in1.begin(), in1.end());
  87     std::sort(in2.begin(), in2.end());
  88
  89     for (size_t size = 0; size <= max_size; size = size <= 16 ? size + 1 : size_t(3.1415 * size))
  90     {
  91         invoke_on_all_policies(test_merge(), in1.cbegin(), in1.cbegin() + size, in2.data(), in2.data() + size / 2,
  92                                out.begin(), out.begin() + 1.5 * size, std::less<T>());
  93         invoke_on_all_policies(test_merge(), in1.data(), in1.data() + size, in2.cbegin(), in2.cbegin() + size / 2,
  94                                out.begin(), out.begin() + 3 * size / 2, std::less<T>());
  95     }
  96 }
  97
  98 template <typename T>
  99 struct test_non_const
 100 {
 101     template <typename Policy, typename InputIterator, typename OutputIterator>
 102     void
 103     operator()(Policy&& exec, InputIterator input_iter, OutputIterator out_iter)
 104     {
 105         merge(exec, input_iter, input_iter, input_iter, input_iter, out_iter, non_const(std::less<T>()));
 106     }
 107 };
 108
 109 int
 110 main()
 111 {
 112     test_merge_by_type<int32_t>([](size_t v) { return (v % 2 == 0 ? v : -v) * 3; }, [](size_t v) { return v * 2; });
 113     test_merge_by_type<float64_t>([](size_t v) { return float64_t(v); }, [](size_t v) { return float64_t(v - 100); });
 114
 115 #if !defined(_PSTL_ICC_16_17_TEST_64_TIMEOUT)
 116     test_merge_by_type<Wrapper<int16_t>>([](size_t v) { return Wrapper<int16_t>(v % 100); },
 117                                          [](size_t v) { return Wrapper<int16_t>(v % 10); });
 118 #endif
 119
 120     test_algo_basic_double<int32_t>(run_for_rnd_fw<test_non_const<int32_t>>());
 121
 122     std::cout << done() << std::endl;
 123     return 0;
 124 }