text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <algorithm>
  
  // template<class ForwardIterator, class Predicate>
  //     constexpr ForwardIterator       // constexpr after C++17
  //     partition_point(ForwardIterator first, ForwardIterator last, Predicate pred);
  
  #include <algorithm>
  #include <cassert>
  
  #include "test_macros.h"
  #include "test_iterators.h"
  
  struct is_odd
  {
      TEST_CONSTEXPR bool operator()(const int& i) const {return i & 1;}
  };
  
  
  #if TEST_STD_VER > 17
  TEST_CONSTEXPR bool test_constexpr() {
      int ia[] = {1, 3, 5, 2, 4, 6};
      int ib[] = {1, 2, 3, 4, 5, 6};
      return    (std::partition_point(std::begin(ia), std::end(ia), is_odd()) == ia+3)
             && (std::partition_point(std::begin(ib), std::end(ib), is_odd()) == ib+1)
             ;
      }
  #endif
  
  
  int main(int, char**)
  {
      {
          const int ia[] = {2, 4, 6, 8, 10};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia));
      }
      {
          const int ia[] = {1, 2, 4, 6, 8};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia + 1));
      }
      {
          const int ia[] = {1, 3, 2, 4, 6};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia + 2));
      }
      {
          const int ia[] = {1, 3, 5, 2, 4, 6};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia + 3));
      }
      {
          const int ia[] = {1, 3, 5, 7, 2, 4};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia + 4));
      }
      {
          const int ia[] = {1, 3, 5, 7, 9, 2};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia + 5));
      }
      {
          const int ia[] = {1, 3, 5, 7, 9, 11};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::end(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia + 6));
      }
      {
          const int ia[] = {1, 3, 5, 2, 4, 6, 7};
          assert(std::partition_point(forward_iterator<const int*>(std::begin(ia)),
                                      forward_iterator<const int*>(std::begin(ia)),
                                      is_odd()) == forward_iterator<const int*>(ia));
      }
  
  #if TEST_STD_VER > 17
      static_assert(test_constexpr());
  #endif
  
    return 0;
  }
  