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/* Error 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 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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