libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/pstl.transform.unary.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 UnaryOperation>
  17 //   ForwardIterator2
  18 //     transform(ExecutionPolicy&& exec,
  19 //               ForwardIterator1 first1, ForwardIterator1 last1,
  20 //               ForwardIterator2 result, UnaryOperation op);
  21
  22 #include <algorithm>
  23 #include <cassert>
  24 #include <vector>
  25
  26 #include "test_macros.h"
  27 #include "test_execution_policies.h"
  28 #include "test_iterators.h"
  29
  30 // We can't test the constraint on the execution policy, because that would conflict with the binary
  31 // transform algorithm that doesn't take an execution policy, which is not constrained at all.
  32
  33 template <class Iter1, class Iter2>
  34 struct Test {
  35   template <class Policy>
  36   void operator()(Policy&& policy) {
  37     // simple test
  38     for (const int size : {0, 1, 2, 100, 350}) {
  39       std::vector<int> a(size);
  40       for (int i = 0; i != size; ++i)
  41         a[i] = i + 1;
  42
  43       std::vector<int> out(std::size(a));
  44       decltype(auto) ret = std::transform(
  45           policy, Iter1(std::data(a)), Iter1(std::data(a) + std::size(a)), Iter2(std::data(out)), [](int i) {
  46             return i + 3;
  47           });
  48       static_assert(std::is_same_v<decltype(ret), Iter2>);
  49       assert(base(ret) == std::data(out) + std::size(out));
  50       for (int i = 0; i != size; ++i)
  51         assert(out[i] == i + 4);
  52     }
  53   }
  54 };
  55
  56 int main(int, char**) {
  57   types::for_each(types::forward_iterator_list<int*>{}, types::apply_type_identity{[](auto v) {
  58                     using Iter = typename decltype(v)::type;
  59                     types::for_each(
  60                         types::forward_iterator_list<int*>{},
  61                         TestIteratorWithPolicies<types::partial_instantiation<Test, Iter>::template apply>{});
  62                   }});
  63
  64   return 0;
  65 }