/* Value observers for a very simple basic_result type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (2 commits)
File Created: Oct 2017


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

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*/

#ifndef BOOST_OUTCOME_RESULT_VALUE_OBSERVERS_HPP
#define BOOST_OUTCOME_RESULT_VALUE_OBSERVERS_HPP

#include "basic_result_storage.hpp"

BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN

namespace detail
{
  template <class Base, class R, class NoValuePolicy> class basic_result_value_observers : public Base
  {
  public:
    using value_type = R;
    using Base::Base;

    constexpr value_type &assume_value() & noexcept
    {
      NoValuePolicy::narrow_value_check(static_cast<basic_result_value_observers &>(*this));
      return this->_state._value;  // NOLINT
    }
    constexpr const value_type &assume_value() const &noexcept
    {
      NoValuePolicy::narrow_value_check(static_cast<const basic_result_value_observers &>(*this));
      return this->_state._value;  // NOLINT
    }
    constexpr value_type &&assume_value() && noexcept
    {
      NoValuePolicy::narrow_value_check(static_cast<basic_result_value_observers &&>(*this));
      return static_cast<value_type &&>(this->_state._value);  // NOLINT
    }
    constexpr const value_type &&assume_value() const &&noexcept
    {
      NoValuePolicy::narrow_value_check(static_cast<const basic_result_value_observers &&>(*this));
      return static_cast<const value_type &&>(this->_state._value);  // NOLINT
    }

    constexpr value_type &value() &
    {
      NoValuePolicy::wide_value_check(static_cast<basic_result_value_observers &>(*this));
      return this->_state._value;  // NOLINT
    }
    constexpr const value_type &value() const &
    {
      NoValuePolicy::wide_value_check(static_cast<const basic_result_value_observers &>(*this));
      return this->_state._value;  // NOLINT
    }
    constexpr value_type &&value() &&
    {
      NoValuePolicy::wide_value_check(static_cast<basic_result_value_observers &&>(*this));
      return static_cast<value_type &&>(this->_state._value);  // NOLINT
    }
    constexpr const value_type &&value() const &&
    {
      NoValuePolicy::wide_value_check(static_cast<const basic_result_value_observers &&>(*this));
      return static_cast<const value_type &&>(this->_state._value);  // NOLINT
    }
  };
  template <class Base, class NoValuePolicy> class basic_result_value_observers<Base, void, NoValuePolicy> : public Base
  {
  public:
    using Base::Base;

    constexpr void assume_value() const noexcept { NoValuePolicy::narrow_value_check(*this); }
    constexpr void value() const { NoValuePolicy::wide_value_check(*this); }
  };
}  // namespace detail

BOOST_OUTCOME_V2_NAMESPACE_END

#endif
