libcxx/test/std/algorithms/alg.nonmodifying/alg.find/pstl.find.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 ForwardIterator, class T>
  16 //   ForwardIterator find(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last,
  17 //                        const T& value);
  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
  27 EXECUTION_POLICY_SFINAE_TEST(find);
  28
  29 static_assert(sfinae_test_find<int, int*, int*, bool (*)(int)>);
  30 static_assert(!sfinae_test_find<std::execution::parallel_policy, int*, int*, int>);
  31
  32 template <class Iter>
  33 struct Test {
  34   template <class Policy>
  35   void operator()(Policy&& policy) {
  36     int a[] = {1, 2, 3, 4, 5, 6, 7, 8};
  37
  38     // simple test
  39     assert(base(std::find(policy, Iter(std::begin(a)), Iter(std::end(a)), 3)) == a + 2);
  40
  41     // check that last is returned if no element matches
  42     assert(base(std::find(policy, Iter(std::begin(a)), Iter(std::end(a)), 0)) == std::end(a));
  43
  44     // check that the first element is returned
  45     assert(base(std::find(policy, Iter(std::begin(a)), Iter(std::end(a)), 1)) == std::begin(a));
  46
  47     // check that an empty range works
  48     assert(base(std::find(policy, Iter(std::begin(a)), Iter(std::begin(a)), 1)) == std::begin(a));
  49
  50     // check that a one-element range works
  51     assert(base(std::find(policy, Iter(std::begin(a)), Iter(std::begin(a) + 1), 1)) == std::begin(a));
  52
  53     // check that a two-element range works
  54     assert(base(std::find(policy, Iter(std::begin(a)), Iter(std::begin(a) + 2), 2)) == std::begin(a) + 1);
  55
  56     // check that a large number of elements works
  57     std::vector<int> vec(200, 4);
  58     vec[176] = 5;
  59     assert(base(std::find(policy, Iter(std::data(vec)), Iter(std::data(vec) + std::size(vec)), 5)) ==
  60            std::data(vec) + 176);
  61   }
  62 };
  63
  64 int main(int, char**) {
  65   types::for_each(types::forward_iterator_list<int*>{}, TestIteratorWithPolicies<Test>{});
  66
  67   return 0;
  68 }