libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/pstl.copy.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 // REQUIRES: with-pstl
  12
  13 // <algorithm>
  14
  15 // template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2>
  16 //   ForwardIterator2 copy(ExecutionPolicy&& policy,
  17 //                         ForwardIterator1 first, ForwardIterator1 last,
  18 //                         ForwardIterator2 result);
  19
  20 #include <algorithm>
  21 #include <vector>
  22
  23 #include "test_macros.h"
  24 #include "test_execution_policies.h"
  25 #include "test_iterators.h"
  26
  27 EXECUTION_POLICY_SFINAE_TEST(copy);
  28
  29 static_assert(sfinae_test_copy<int, int*, int*, bool (*)(int)>);
  30 static_assert(!sfinae_test_copy<std::execution::parallel_policy, int*, int*, int>);
  31
  32 template <class Iter1, class Iter2>
  33 struct TestInt {
  34   template <class Policy>
  35   void operator()(Policy&& policy) {
  36     // simple test
  37     for (const int size : {0, 1, 2, 100, 350}) {
  38       std::vector<int> a(size);
  39       for (int i = 0; i != size; ++i)
  40         a[i] = i + 1;
  41
  42       std::vector<int> out(std::size(a));
  43       decltype(auto) ret =
  44           std::copy(policy, Iter1(std::data(a)), Iter1(std::data(a) + std::size(a)), Iter2(std::data(out)));
  45       static_assert(std::is_same_v<decltype(ret), Iter2>);
  46       assert(base(ret) == std::data(out) + std::size(out));
  47       for (int i = 0; i != size; ++i)
  48         assert(out[i] == i + 1);
  49     }
  50   }
  51 };
  52
  53 struct CopiedToTester {
  54   bool copied_to   = false;
  55   CopiedToTester() = default;
  56   CopiedToTester(const CopiedToTester&) {}
  57   CopiedToTester& operator=(const CopiedToTester&) {
  58     assert(!copied_to);
  59     copied_to = true;
  60     return *this;
  61   }
  62   ~CopiedToTester() = default;
  63 };
  64
  65 template <class Iter1, class Iter2>
  66 struct TestNonTrivial {
  67   template <class Policy>
  68   void operator()(Policy&& policy) {
  69     // simple test
  70     for (const int size : {0, 1, 2, 100, 350}) {
  71       std::vector<CopiedToTester> a(size);
  72
  73       std::vector<CopiedToTester> out(std::size(a));
  74       auto ret = std::copy(policy, Iter1(std::data(a)), Iter1(std::data(a) + std::size(a)), Iter2(std::data(out)));
  75       assert(base(ret) == std::data(out) + std::size(out));
  76       assert(std::all_of(std::begin(out), std::end(out), [](CopiedToTester& t) { return t.copied_to; }));
  77       assert(std::none_of(std::begin(a), std::end(a), [](CopiedToTester& t) { return t.copied_to; }));
  78     }
  79   }
  80 };
  81
  82 struct TestIteratorsNonTrivial {
  83   template <class Iter2>
  84   void operator()() {}
  85 };
  86
  87 int main(int, char**) {
  88   types::for_each(types::forward_iterator_list<int*>{}, types::apply_type_identity{[](auto v) {
  89                     using Iter = typename decltype(v)::type;
  90                     types::for_each(
  91                         types::forward_iterator_list<int*>{},
  92                         TestIteratorWithPolicies< types::partial_instantiation<TestInt, Iter>::template apply>{});
  93                   }});
  94
  95   types::for_each(
  96       types::forward_iterator_list<CopiedToTester*>{}, types::apply_type_identity{[](auto v) {
  97         using Iter = typename decltype(v)::type;
  98         types::for_each(
  99             types::forward_iterator_list<CopiedToTester*>{},
 100             TestIteratorWithPolicies< types::partial_instantiation<TestNonTrivial, Iter>::template apply>{});
 101       }});
 102
 103   return 0;
 104 }