/* Exception observers for outcome type
(C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
File Created: Oct 2017


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_BASIC_OUTCOME_EXCEPTION_OBSERVERS_IMPL_HPP
#define BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_IMPL_HPP

#include "basic_outcome_exception_observers.hpp"

#include "../policy/base.hpp"

BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN

namespace policy
{
  template <class R, class S, class P, class NoValuePolicy, class Impl> inline constexpr auto &&base::_exception(Impl &&self) noexcept
  {
    // Impl will be some internal implementation class which has no knowledge of the _ptr stored
    // beneath it. So statically cast, preserving rvalue and constness, to the derived class.
    using Outcome = BOOST_OUTCOME_V2_NAMESPACE::detail::rebind_type<basic_outcome<R, S, P, NoValuePolicy>, decltype(self)>;
#if defined(_MSC_VER) && _MSC_VER < 1920
    // VS2017 tries a copy construction in the correct implementation despite that Outcome is always a rvalue or lvalue ref! :(
    basic_outcome<R, S, P, NoValuePolicy> &_self = (basic_outcome<R, S, P, NoValuePolicy> &) (self);  // NOLINT
#else
    Outcome _self = static_cast<Outcome>(self);  // NOLINT
#endif
    return static_cast<Outcome>(_self)._ptr;
  }
}  // namespace policy

namespace detail
{
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() & noexcept
  {
    NoValuePolicy::narrow_exception_check(*this);
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
  }
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() const &noexcept
  {
    NoValuePolicy::narrow_exception_check(*this);
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
  }
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() && noexcept
  {
    NoValuePolicy::narrow_exception_check(std::move(*this));
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
  }
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() const &&noexcept
  {
    NoValuePolicy::narrow_exception_check(std::move(*this));
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
  }

  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() &
  {
    NoValuePolicy::wide_exception_check(*this);
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
  }
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() const &
  {
    NoValuePolicy::wide_exception_check(*this);
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
  }
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() &&
  {
    NoValuePolicy::wide_exception_check(std::move(*this));
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
  }
  template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() const &&
  {
    NoValuePolicy::wide_exception_check(std::move(*this));
    return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
  }
}  // namespace detail

BOOST_OUTCOME_V2_NAMESPACE_END

#endif