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:

Copyright : KUMI Project Contributors
 
Boost Software License - Version 1.0 - August 17th, 2003
 
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
 
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.