The C++20 Compact Tuple Tools

KUMI is a fancy C++20 implementation of a tuple-like class. It tries to be as close to std::tuple as possible but also wants to compile faster, uses a better C++20 oriented interface, and new features like:

• A fast to compile tuple implementation
• Quality of life improvement over the standard tuple implementation
• A protocol to adapt user-defined type to act as tuples
• Algorithm on tuples
• Record type handling

Examples

• Tuple

  #include <iostream>
  #include <kumi/kumi.hpp>
   
  auto get_student(int id)
  {
          if (id == 0)  return kumi::make_tuple(3.8, 'A', "Lisa Simpson");
    else  if (id == 1)  return kumi::make_tuple(2.9, 'C', "Milhouse Van Houten");
    else  if (id == 2)  return kumi::make_tuple(1.7, 'D', "Ralph Wiggum");
    else                return kumi::make_tuple(0. , 'F', "Unknown");
  }
   
  int main()
  {
    auto student0 = get_student(0);
   
    std::cout << "ID: 0, "
              << "GPA:   " << kumi::get<0>(student0) << ", "
              << "grade: " << kumi::get<1>(student0) << ", "
              << "name:  " << kumi::get<2>(student0) << '\n';
   
    auto [ gpa1, grade1, name1 ] = get_student(1);
    std::cout << "ID: 1, "
              << "GPA: "   << gpa1   << ", "
              << "grade: " << grade1 << ", "
              << "name: "  << name1  << '\n';
    std::cout << "\n";
   
    auto all_students = kumi::make_tuple(get_student(0),get_student(1),get_student(2));
   
    kumi::for_each_index( [](auto i, auto const& m) {
                          std::cout << "Data #" << i << " : " << m << "\n";
                        }
                        , all_students
                        );
    std::cout << "\n";
   
    auto grades = kumi::get<0>(kumi::transpose(all_students));
    std::cout << grades << "\n";
  }

• Record

  #include <iostream>
  #include <kumi/kumi.hpp>
   
  using namespace kumi::literals;
  auto get_student(int id)
  {
          if (id == 0)  return kumi::make_record("GPA"_id = 3.8, "grade"_id = 'A');
    else  if (id == 1)  return kumi::make_record("GPA"_id = 2.9, "grade"_id = 'C');
    else  if (id == 2)  return kumi::make_record("GPA"_id = 1.7, "grade"_id = 'D');
    else                return kumi::make_record("GPA"_id = 0. , "grade"_id = 'F');
  }
   
  int main()
  {
    auto student0 = get_student(0);
   
    std::cout << "ID: 0, "
              << "GPA:   "  << kumi::get<"GPA">(student0)   << ", "
              << "grade: "  << kumi::get<"grade">(student0) << '\n';
   
    auto [ gpa1, grade1 ] = get_student(1);
    std::cout << "ID: 1, "
              << gpa1   << ", "
              << grade1 << '\n';
    std::cout << "\n";
   
    auto all_students = kumi::make_record(
                        "Lisa Simpson"_id         = get_student(0),
                        "Milhouse Van Houten"_id  = get_student(1),
                        "Ralph Wiggum"_id         = get_student(2)
                        );
   
    kumi::for_each_field( [](auto name, auto const& m) {
                          std::cout << "Student: " << name << ", Data : " << m << "\n";
                        }
                        , all_students
                        );
    std::cout << "\n";
  }

Licence

This library is licensed under the Boost Software License. The full license text is available on the Licence page.