74 lines · 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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++1410 11// UNSUPPORTED: libcpp-has-no-incomplete-pstl12 13// <numeric>14 15// template<class ExecutionPolicy, class ForwardIterator>16// typename iterator_traits<ForwardIterator>::value_type17// reduce(ExecutionPolicy&& exec,18// ForwardIterator first, ForwardIterator last);19// template<class ExecutionPolicy, class ForwardIterator, class T, class BinaryOperation>20// T reduce(ExecutionPolicy&& exec,21// ForwardIterator first, ForwardIterator last, T init,22// BinaryOperation binary_op);23 24#include <numeric>25#include <vector>26 27#include "MoveOnly.h"28#include "test_execution_policies.h"29#include "test_iterators.h"30#include "test_macros.h"31 32template <class Iter, class ValueT>33struct Test {34 template <class Policy>35 void operator()(Policy&& policy) {36 for (const auto& pair : {std::pair{0, 34}, {1, 36}, {2, 39}, {100, 5184}, {350, 61809}}) {37 auto [size, expected] = pair;38 std::vector<int> a(size);39 for (int i = 0; i != size; ++i)40 a[i] = i;41 42 {43 decltype(auto) ret = std::reduce(44 policy, Iter(std::data(a)), Iter(std::data(a) + std::size(a)), ValueT(34), [](ValueT i, ValueT j) {45 return i + j + 2;46 });47 static_assert(std::is_same_v<decltype(ret), ValueT>);48 assert(ret == ValueT(expected));49 }50 {51 decltype(auto) ret = std::reduce(policy, Iter(std::data(a)), Iter(std::data(a) + std::size(a)), ValueT(34));52 static_assert(std::is_same_v<decltype(ret), ValueT>);53 assert(ret == expected - 2 * size);54 }55 {56 decltype(auto) ret = std::reduce(policy, Iter(std::data(a)), Iter(std::data(a) + std::size(a)));57 static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::value_type>);58 assert(ret == expected - 2 * size - 34);59 }60 }61 }62};63 64int main(int, char**) {65 types::for_each(types::forward_iterator_list<int*>{}, types::apply_type_identity{[](auto v) {66 using Iter = typename decltype(v)::type;67 types::for_each(68 types::type_list<int, MoveOnly>{},69 TestIteratorWithPolicies<types::partial_instantiation<Test, Iter>::template apply>{});70 }});71 72 return 0;73}74