operator[]() [2/4]

template<typename... Ts>

template<concepts::identifier Id>
requires (concepts::contains_field<Id, Ts...>)

decltype(auto) kumi::record< Ts >::operator[] ( Id const & ) &

inlineconstexprnoexcept

Extracts the element whose identifier matches Id from a kumi::record.

Note

Does not participate in overload resolution if there are no field which identifier matches Id in the record.

Template Parameters

Id	Identifier of the element to access

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 = { "x"_id = 1, "y"_id = 2.3, "z"_id = 4.5f, "t"_id = '@' };
  std::cout << r << "\n";
  std::cout << r["x"_id] << "\n";
  std::cout << r["y"_id] << "\n";
  std::cout << r["z"_id] << "\n";
 
  r["t"_id]++;
 
  std::cout << r["t"_id] << "\n";
}