draconisplusplus/include/rfl/internal/extract_discriminators.hpp

#ifndef RFL_INTERNAL_EXTRACTDISTRIMINATORS_HPP_
#define RFL_INTERNAL_EXTRACTDISTRIMINATORS_HPP_

#include <type_traits>

#include "../TaggedUnion.hpp"
#include "../define_literal.hpp"
#include "../field_type.hpp"

namespace rfl {
  namespace internal {

    template <class TaggedUnionType>
    struct extract_discriminators;

    template <StringLiteral _discriminator, class... NamedTupleType>
    struct extract_discriminators<
        TaggedUnion<_discriminator, NamedTupleType...>> {
      using type = define_literal_t<
          std::remove_cvref_t<field_type_t<_discriminator, NamedTupleType>>...>;
    };

  } // namespace internal
} // namespace rfl

#endif