/* Traits for Outcome
(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (3 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
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*/

#ifndef BOOST_OUTCOME_TRAIT_STD_EXCEPTION_HPP
#define BOOST_OUTCOME_TRAIT_STD_EXCEPTION_HPP

#include "../config.hpp"

#include <exception>

BOOST_OUTCOME_V2_NAMESPACE_BEGIN

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

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

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

  namespace detail
  {
    template <bool has_error_payload> struct _rethrow_exception
    {
      template <class Exception> explicit _rethrow_exception(Exception && /*unused*/)  // NOLINT
      {
      }
    };
    template <> struct _rethrow_exception<true>
    {
      template <class Exception> explicit _rethrow_exception(Exception &&excpt)  // NOLINT
      {
        // ADL
        rethrow_exception(policy::exception_ptr(std::forward<Exception>(excpt)));
      }
    };
  }  // namespace detail
}  // namespace policy

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

  // std::exception_ptr is an error type
  template <> struct is_error_type<std::exception_ptr>
  {
    static constexpr bool value = true;
  };

}  // namespace trait

BOOST_OUTCOME_V2_NAMESPACE_END

#endif