identifier_of()

template<typename T>

auto kumi::identifier_of ( )

inlinenodiscardconstevalnoexcept

Extracts the identifiers from a kumi::concepts::field or returns the parameter.

Note

If the unqualified type of input does not model kumi::concepts::field, returns kumi::unkown.

Template Parameters

T	The type to extract the identifier from.

Returns

The identifier of the field or kumi::unknown.

Helper type

namespace kumi::result
{
  template<typename Ts> struct identifier_of;
 
  template<typename T> using identifier_of_t = typename identifier_of<T>::type;
}

Computes the return type of a call to kumi::identifier_of

Example:

#include <kumi/kumi.hpp>
#include <iostream>
 
int main()
{
  using namespace kumi::literals;
 
  auto field = ( "x"_id = 1 ); 
  int standard = { 12 };
 
  std::cout << field << "\n";
  std::cout << kumi::identifier_of<decltype(field)>() << "\n";
  
  std::cout << standard << "\n";
  std::cout << kumi::identifier_of<decltype(standard)>() << "\n";
}