__as_pointer.hpp

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#pragma once

#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif

namespace xtd {
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(const current_type& value) -> const new_type& {
    thread_local static __as_enum__<new_type, current_type, typename std::is_enum<current_type>::type> e;
    return e.convert(value);
  }
  
  template<typename new_type, typename current_type>
  requires (!std::is_null_pointer_v<new_type>)
  [[nodiscard]] auto as(current_type& value) -> new_type& {
    thread_local static __as_enum__<new_type, current_type, typename std::is_enum<current_type>::type> e;
    return e.convert(value);
  }
  
  template<typename new_type, typename current_type>
  requires std::is_null_pointer_v<new_type>
  [[nodiscard]] auto as(current_type& value) -> new_type& {
    if (!std::is_null_pointer_v<current_type>) xtd::helpers::throw_helper::throws(xtd::helpers::exception_case::invalid_cast);
    return value;
  }

  template<typename new_type, typename current_type>
  [[nodiscard]] inline auto as(const current_type* value) -> const new_type* {
    return xtd::convert_pointer::to_ptr<new_type>(value);
  }
  
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(current_type* value) -> new_type* {
    return xtd::convert_pointer::to_ptr<new_type>(value);
  }
  
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(xtd::uptr<current_type>& value) -> xtd::uptr<new_type> {
    return xtd::convert_pointer::to_unique_ptr<new_type>(value);
  }
  
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(xtd::uptr<current_type>&& value) -> xtd::uptr<new_type> {
    return xtd::convert_pointer::to_unique_ptr<new_type>(value);
  }
  
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(const xtd::sptr<current_type>& value) -> xtd::sptr<new_type> {
    return xtd::convert_pointer::to_shared_ptr<new_type>(value);
  }
  
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(xtd::sptr<current_type>& value) -> xtd::sptr<new_type> {
    return xtd::convert_pointer::to_shared_ptr<new_type>(value);
  }
  
  template<typename new_type, typename current_type>
  [[nodiscard]] auto as(xtd::sptr<current_type>&& value) -> xtd::sptr<new_type> {
    return xtd::convert_pointer::to_shared_ptr<new_type>(value);
  }
}