text: //  Copyright Vladimir Prus 2004.
  //
  //  SPDX-License-Identifier: BSL-1.0
  //  Distributed under the Boost Software License, Version 1.0.
  //  (See accompanying file LICENSE_1_0.txt
  //  or copy at http://www.boost.org/LICENSE_1_0.txt)
  
  #include <hpx/hpx_main.hpp>
  #include <hpx/modules/filesystem.hpp>
  #include <hpx/modules/testing.hpp>
  
  #include <hpx/program_options/errors.hpp>
  #include <hpx/program_options/options_description.hpp>
  #include <hpx/program_options/parsers.hpp>
  #include <hpx/program_options/positional_options.hpp>
  #include <hpx/program_options/value_semantic.hpp>
  
  #include <cstddef>
  #include <limits>
  #include <vector>
  
  using namespace hpx::program_options;
  using namespace std;
  
  void test_positional_options()
  {
      positional_options_description p;
      p.add("first", 1);
  
      HPX_TEST_EQ(p.max_total_count(), 1u);
      HPX_TEST_EQ(p.name_for_position(0), "first");
  
      p.add("second", 2);
  
      HPX_TEST_EQ(p.max_total_count(), 3u);
      HPX_TEST_EQ(p.name_for_position(0), "first");
      HPX_TEST_EQ(p.name_for_position(1), "second");
      HPX_TEST_EQ(p.name_for_position(2), "second");
  
      p.add("third", -1);
  
      HPX_TEST_EQ(p.max_total_count(), (std::numeric_limits<unsigned>::max)());
      HPX_TEST_EQ(p.name_for_position(0), "first");
      HPX_TEST_EQ(p.name_for_position(1), "second");
      HPX_TEST_EQ(p.name_for_position(2), "second");
      HPX_TEST_EQ(p.name_for_position(3), "third");
      HPX_TEST_EQ(p.name_for_position(10000), "third");
  }
  
  void test_parsing()
  {
      options_description desc;
      // clang-format off
      desc.add_options()
          ("first", value<int>())
          ("second", value<int>())
          ("input-file", value< vector<string> >())
          ("some-other", value<string>())
      ;
      // clang-format on
  
      positional_options_description p;
      p.add("input-file", 2).add("some-other", 1);
  
      vector<string> args;
      args.emplace_back("--first=10");
      args.emplace_back("file1");
      args.emplace_back("--second=10");
      args.emplace_back("file2");
      args.emplace_back("file3");
  
      // Check that positional options are handled.
      parsed_options parsed =
          command_line_parser(args).options(desc).positional(p).run();
  
      HPX_TEST_EQ(parsed.options.size(), std::size_t(5));
      HPX_TEST_EQ(parsed.options[1].string_key, "input-file");
      HPX_TEST_EQ(parsed.options[1].value[0], "file1");
      HPX_TEST_EQ(parsed.options[3].string_key, "input-file");
      HPX_TEST_EQ(parsed.options[3].value[0], "file2");
      HPX_TEST_EQ(parsed.options[4].value[0], "file3");
  
      args.emplace_back("file4");
  
      // Check that excessive number of positional options is detected.
      HPX_TEST_THROW(command_line_parser(args).options(desc).positional(p).run(),
          too_many_positional_options_error);
  }
  
  int main(int, char*[])
  {
      test_positional_options();
      test_parsing();
  
      return hpx::util::report_errors();
  }
  