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- /* Error observers for a very simple basic_result type
- (C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (2 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
- obtaining a copy of the software and accompanying documentation covered by
- this license (the "Software") to use, reproduce, display, distribute,
- execute, and transmit the Software, and to prepare derivative works of the
- Software, and to permit third-parties to whom the Software is furnished to
- do so, all subject to the following:
- The copyright notices in the Software and this entire statement, including
- the above license grant, this restriction and the following disclaimer,
- must be included in all copies of the Software, in whole or in part, and
- all derivative works of the Software, unless such copies or derivative
- works are solely in the form of machine-executable object code generated by
- a source language processor.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
- SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
- FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
- ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- DEALINGS IN THE SOFTWARE.
- */
- #ifndef BOOST_OUTCOME_BASIC_RESULT_ERROR_OBSERVERS_HPP
- #define BOOST_OUTCOME_BASIC_RESULT_ERROR_OBSERVERS_HPP
- #include "basic_result_storage.hpp"
- BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
- namespace detail
- {
- template <class Base, class EC, class NoValuePolicy> class basic_result_error_observers : public Base
- {
- public:
- using error_type = EC;
- using Base::Base;
- constexpr error_type &assume_error() & noexcept
- {
- NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &>(*this));
- return this->_error;
- }
- constexpr const error_type &assume_error() const &noexcept
- {
- NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &>(*this));
- return this->_error;
- }
- constexpr error_type &&assume_error() && noexcept
- {
- NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &&>(*this));
- return static_cast<error_type &&>(this->_error);
- }
- constexpr const error_type &&assume_error() const &&noexcept
- {
- NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &&>(*this));
- return static_cast<const error_type &&>(this->_error);
- }
- constexpr error_type &error() &
- {
- NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &>(*this));
- return this->_error;
- }
- constexpr const error_type &error() const &
- {
- NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &>(*this));
- return this->_error;
- }
- constexpr error_type &&error() &&
- {
- NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &&>(*this));
- return static_cast<error_type &&>(this->_error);
- }
- constexpr const error_type &&error() const &&
- {
- NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &&>(*this));
- return static_cast<const error_type &&>(this->_error);
- }
- };
- template <class Base, class NoValuePolicy> class basic_result_error_observers<Base, void, NoValuePolicy> : public Base
- {
- public:
- using Base::Base;
- constexpr void assume_error() const noexcept { NoValuePolicy::narrow_error_check(*this); }
- constexpr void error() const { NoValuePolicy::wide_error_check(*this); }
- };
- } // namespace detail
- BOOST_OUTCOME_V2_NAMESPACE_END
- #endif
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