operator[]() [1/4]

template<typename... Ts>

template<typename T>
requires (concepts::uniquely_typed<Ts...> && concepts::contains_type<T, Ts...>)

decltype(auto) kumi::tuple< Ts >::operator[] ( as< T > type ) &

inlineconstexprnoexcept

Extracts the element with type T from a kumi::tuple.

Note

Does not participate in overload resolution if T is not present in the tuple or if the tuple contains duplicate types

Parameters

type	The type to access in the tuple

Returns

A reference to the selected element of the current tuple.

Example:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  kumi::tuple t = { 1, 2.3, 4.5f, '@' };
 
  // It is possible to have mixed nammed and unnamed fields
  std::cout << t[ kumi::as<int>{}    ] << "\n";
  std::cout << t[ kumi::as<double>{} ] << "\n";
  std::cout << t[ kumi::as<float>{}  ] << "\n";
 
  t[kumi::as<int>{}]++;
 
  std::cout << t[kumi::as<int>{}] << "\n";
}