libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/pstl.transform.binary.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14
  10
  11 // UNSUPPORTED: libcpp-has-no-incomplete-pstl
  12
  13 // <algorithm>
  14
  15 // template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2,
  16 //          class ForwardIterator, class BinaryOperation>
  17 //   ForwardIterator
  18 //     transform(ExecutionPolicy&& exec,
  19 //               ForwardIterator1 first1, ForwardIterator1 last1,
  20 //               ForwardIterator2 first2, ForwardIterator result,
  21 //               BinaryOperation binary_op);
  22
  23 #include <algorithm>
  24 #include <vector>
  25
  26 #include "test_macros.h"
  27 #include "test_execution_policies.h"
  28 #include "test_iterators.h"
  29
  30 EXECUTION_POLICY_SFINAE_TEST(transform);
  31
  32 static_assert(sfinae_test_transform<int, int*, int*, int*, int*, bool (*)(int)>);
  33 static_assert(!sfinae_test_transform<std::execution::parallel_policy, int*, int*, int*, int*, int (*)(int, int)>);
  34
  35 template <class Iter1, class Iter2, class Iter3>
  36 struct Test {
  37   template <class Policy>
  38   void operator()(Policy&& policy) {
  39     // simple test
  40     for (const int size : {0, 1, 2, 100, 350}) {
  41       std::vector<int> a(size);
  42       std::vector<int> b(size);
  43       for (int i = 0; i != size; ++i) {
  44         a[i] = i + 1;
  45         b[i] = i - 3;
  46       }
  47
  48       std::vector<int> out(std::size(a));
  49       decltype(auto) ret = std::transform(
  50           policy,
  51           Iter1(std::data(a)),
  52           Iter1(std::data(a) + std::size(a)),
  53           Iter2(std::data(b)),
  54           Iter3(std::data(out)),
  55           [](int i, int j) { return i + j + 3; });
  56       static_assert(std::is_same_v<decltype(ret), Iter3>);
  57       assert(base(ret) == std::data(out) + std::size(out));
  58       for (int i = 0; i != size; ++i) {
  59         assert(out[i] == i * 2 + 1);
  60       }
  61     }
  62   }
  63 };
  64
  65 int main(int, char**) {
  66   types::for_each(
  67       types::forward_iterator_list<int*>{}, types::apply_type_identity{[](auto v) {
  68         using Iter3 = typename decltype(v)::type;
  69         types::for_each(
  70             types::forward_iterator_list<int*>{}, types::apply_type_identity{[](auto v2) {
  71               using Iter2 = typename decltype(v2)::type;
  72               types::for_each(
  73                   types::forward_iterator_list<int*>{},
  74                   TestIteratorWithPolicies<types::partial_instantiation<Test, Iter2, Iter3>::template apply>{});
  75             }});
  76       }});
  77
  78   return 0;
  79 }