OTS/OTSCPP/Tools/boost/outcome/detail/trait_std_error_code.hpp

/* Traits for Outcome
(C) 2018-2020 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
File Created: March 2018


Boost Software License - Version 1.0 - August 17th, 2003

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
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*/

#ifndef BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP
#define BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP

#include "../config.hpp"

#include <system_error>

BOOST_OUTCOME_V2_NAMESPACE_BEGIN

namespace detail
{
  // Customise _set_error_is_errno
  template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_code &error)
  {
    if(error.category() == std::generic_category()
#ifndef _WIN32
       || error.category() == std::system_category()
#endif
    )
    {
      state._status.set_have_error_is_errno(true);
    }
  }
  template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_condition &error)
  {
    if(error.category() == std::generic_category()
#ifndef _WIN32
       || error.category() == std::system_category()
#endif
    )
    {
      state._status.set_have_error_is_errno(true);
    }
  }
  template <class State> constexpr inline void _set_error_is_errno(State &state, const std::errc & /*unused*/) {
      state._status.set_have_error_is_errno(true);
   }

}  // namespace detail

namespace policy
{
  namespace detail
  {
    /* Pass through `make_error_code` function for `std::error_code`.
     */
    inline std::error_code make_error_code(std::error_code v) { return v; }

    // Try ADL, if not use fall backs above
    template <class T> constexpr inline decltype(auto) error_code(T &&v) { return make_error_code(std::forward<T>(v)); }

    struct std_enum_overload_tag
    {
    };
  }  // namespace detail

  /*! AWAITING HUGO JSON CONVERSION TOOL 
SIGNATURE NOT RECOGNISED
*/
  template <class T> constexpr inline decltype(auto) error_code(T &&v) { return detail::error_code(std::forward<T>(v)); }

  /*! AWAITING HUGO JSON CONVERSION TOOL 
SIGNATURE NOT RECOGNISED
*/
  // inline void outcome_throw_as_system_error_with_payload(...) = delete;  // To use the error_code_throw_as_system_error policy with a custom Error type, you must define a outcome_throw_as_system_error_with_payload() free function to say how to handle the payload
  inline void outcome_throw_as_system_error_with_payload(const std::error_code &error) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(error)); }  // NOLINT
  BOOST_OUTCOME_TEMPLATE(class Error)
  BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(std::is_error_code_enum<std::decay_t<Error>>::value || std::is_error_condition_enum<std::decay_t<Error>>::value))
  inline void outcome_throw_as_system_error_with_payload(Error &&error, detail::std_enum_overload_tag /*unused*/ = detail::std_enum_overload_tag()) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(make_error_code(error))); }  // NOLINT
}  // namespace policy

namespace trait
{
  namespace detail
  {
    template <> struct _is_error_code_available<std::error_code>
    {
      // Shortcut this for lower build impact
      static constexpr bool value = true;
      using type = std::error_code;
    };
  }  // namespace detail

  // std::error_code is an error type
  template <> struct is_error_type<std::error_code>
  {
    static constexpr bool value = true;
  };
  // For std::error_code, std::is_error_condition_enum<> is the trait we want.
  template <class Enum> struct is_error_type_enum<std::error_code, Enum>
  {
    static constexpr bool value = std::is_error_condition_enum<Enum>::value;
  };

}  // namespace trait

BOOST_OUTCOME_V2_NAMESPACE_END

#endif