/* Value observers for a very simple basic_result type
(C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (2 commits)
File Created: Oct 2017


Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License in the accompanying file
Licence.txt or at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.


Distributed under the Boost Software License, Version 1.0.
    (See accompanying file Licence.txt or copy at
          http://www.boost.org/LICENSE_1_0.txt)
*/

#ifndef OUTCOME_RESULT_VALUE_OBSERVERS_HPP
#define OUTCOME_RESULT_VALUE_OBSERVERS_HPP

#include "basic_result_storage.hpp"

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

OUTCOME_V2_NAMESPACE_END

#endif
