75 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// <algorithm>14 15// template<class ExecutionPolicy, class ForwardIterator, class Predicate>16// ForwardIterator find_if(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last,17// Predicate pred);18 19#include <algorithm>20#include <cassert>21#include <vector>22 23#include "test_macros.h"24#include "test_execution_policies.h"25#include "test_iterators.h"26 27EXECUTION_POLICY_SFINAE_TEST(find_if);28 29static_assert(sfinae_test_find_if<int, int*, int*, bool (*)(int)>);30static_assert(!sfinae_test_find_if<std::execution::parallel_policy, int*, int*, int>);31 32template <class Iter>33struct Test {34 template <class Policy>35 void operator()(Policy&& policy) {36 int a[] = {1, 2, 3, 4, 5, 6, 7, 8};37 38 // simple test39 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::end(a)), [](int i) { return i == 3; })) == a + 2);40 41 // check that last is returned if no element matches42 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::end(a)), [](int i) { return i == 0; })) ==43 std::end(a));44 45 // check that the first element is returned46 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::end(a)), [](int i) { return i == 1; })) ==47 std::begin(a));48 49 // check that an empty range works50 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::begin(a)), [](int i) { return i == 1; })) ==51 std::begin(a));52 53 // check that a one-element range works54 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::begin(a) + 1), [](int i) { return i == 1; })) ==55 std::begin(a));56 57 // check that a two-element range works58 assert(base(std::find_if(policy, Iter(std::begin(a)), Iter(std::begin(a) + 2), [](int i) { return i == 2; })) ==59 std::begin(a) + 1);60 61 // check that a large number of elements works62 std::vector<int> vec(200, 4);63 vec[176] = 5;64 assert(base(std::find_if(policy, Iter(std::data(vec)), Iter(std::data(vec) + std::size(vec)), [](int i) {65 return i == 5;66 })) == std::data(vec) + 176);67 }68};69 70int main(int, char**) {71 types::for_each(types::forward_iterator_list<int*>{}, TestIteratorWithPolicies<Test>{});72 73 return 0;74}75