__as_enum.hpp

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#pragma once
#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif
 
#include "../convert_pointer.hpp"

template<typename new_type, typename current_type, typename bool_t>
struct __as_enum__ {};
 
template<typename new_type, typename current_type>
struct __as_enum__<new_type, current_type, std::true_type> {
  [[nodiscard]] auto convert(const current_type& value) -> const new_type& {
    __result__ = static_cast<new_type>(value);
    return __result__;
  }
  [[nodiscard]] auto convert(current_type& value) -> new_type& {
    __result__ = static_cast<new_type>(value);
    return __result__;
  }
  thread_local inline static new_type __result__ {};
};
 
template<typename new_type, typename current_type>
struct __as_enum__<new_type, current_type, std::false_type> {
  [[nodiscard]] auto convert(const current_type& value) -> const new_type& {
    return xtd::convert_pointer::to_ref<new_type>(value);
  }
  [[nodiscard]] auto convert(current_type& value) -> new_type& {
    return xtd::convert_pointer::to_ref<new_type>(value);
  }
};