operator[]() [1/4]

template<typename... Ts>

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

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

inlineconstexprnoexcept

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

Note

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

Parameters

type	The type to access in the record

Returns

A reference to the selected element of current record.

Example:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
 
  kumi::record r = { "a"_id=1,"b"_id=2.3,"c"_id=4.5f, "d"_id='@' };
 
  std::cout << r[ kumi::as<int>{}    ] << "\n";
  std::cout << r[ kumi::as<double>{} ] << "\n";
  std::cout << r[ kumi::as<float>{}  ] << "\n";
 
  r[kumi::as<int>{}]++;
 
  std::cout << r[kumi::as<int>{}] << "\n";
}