variant_alternative.hpp

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//
// Created by YongGyu Lee on 11/3/23.
//
 
#ifndef VCCC_VARIANT_VARIANT_ALTERNATIVE_HPP
#define VCCC_VARIANT_VARIANT_ALTERNATIVE_HPP
 
#include <cstddef>
#include <type_traits>
 
#include "vccc/__utility/type_sequence.hpp"
 
namespace vccc {
 
 
template<typename... Types>
class variant;
 
template<std::size_t, typename T>
struct variant_alternative;
 
template <std::size_t I, class T>
using variant_alternative_t = typename variant_alternative<I, T>::type;
 
template<std::size_t I, typename T>
struct variant_alternative<I, const T> {
  using type = std::add_const_t<variant_alternative_t<I, T>>;
};
 
template<std::size_t I, typename... Types>
struct variant_alternative<I, variant<Types...>>
    : type_sequence_element_type<I, type_sequence<Types...>> {};
 
 
} // namespace vccc
 
#endif // VCCC_VARIANT_VARIANT_ALTERNATIVE_HPP