for_each_field()

template<typename Function, concepts::record_type R, concepts::record_type... Rs>
requires (concepts::compatible_product_types<R, Rs...>)

void kumi::for_each_field ( Function f, R && r, Rs &&... rs )

inlineconstexpr

Applies the Callable object f on each element of a record type and its field.

Note

This function does not take part in overload resolution if f can't be applied to the elements of t and those of ts, or if the product types are not compatible.

See also

compatible_product_types

This function can only be applied to record types. The function needs to be defined to handle types modeling kumi::concepts::field.

Parameters

f	Callable object to be invoked
r	Record type whose fields are used as arguments to f
rs	Other record types whose elements are used as arguments to f

See also

kumi::for_each

kumi::for_each_index

Example:

#include <kumi/kumi.hpp>
#include <string_view>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
    
  auto t = kumi::record{"a"_id = 1, "b"_id = 2.3, "c"_id = 0.43f };
 
  kumi::for_each_field( [](kumi::str name, auto& m) 
  {
    if(name.as<std::string_view>().ends_with("a"))
      m += 10;
    else if (name == "c")
      m = (m * 100) -1; 
    else
      m *= 10;
    }
    , t
  );
 
  std::cout << t << "\n";
}