operator[]() [2/3]

template<typename... Ts>

template<str Name>
requires ( uniquely_named<Ts...> && contains_field<Name, Ts...> )

constexpr decltype(auto) kumi::tuple< Ts >::operator[] ( field_name< Name >  ) &

inlineconstexprnoexcept

Extracts the element labeled Name from a kumi::tuple.

Note

Does not participate in overload resolution if Name is not present in the tuple or if the tuple contains duplicate names.

Template Parameters

Name	Non type template parameter name of the element to access

Returns

A reference to the selected element of current tuple.

Example:

 
#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
 
  kumi::tuple t = { "x"_f = 1, "y"_f = 2.3, "z"_f = 4.5f, "t"_f = '@' };
  std::cout << t << "\n";
  std::cout << t["x"_f] << "\n";
  std::cout << t["y"_f] << "\n";
  std::cout << t["z"_f] << "\n";
 
  t["t"_f]++;
 
  std::cout << t["t"_f] << "\n";
}