101 lines
3.9 KiB
C++
101 lines
3.9 KiB
C++
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/* Value observers for a very simple basic_result type
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(C) 2017-2022 Niall Douglas <http://www.nedproductions.biz/> (2 commits)
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File Created: Oct 2017
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef BOOST_OUTCOME_RESULT_VALUE_OBSERVERS_HPP
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#define BOOST_OUTCOME_RESULT_VALUE_OBSERVERS_HPP
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#include "basic_result_storage.hpp"
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BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
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namespace detail
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{
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template <class Base, class R, class NoValuePolicy> class basic_result_value_observers : public Base
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{
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public:
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using value_type = R;
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using Base::Base;
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constexpr value_type &assume_value() & noexcept
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{
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NoValuePolicy::narrow_value_check(static_cast<basic_result_value_observers &>(*this));
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return this->_state._value; // NOLINT
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}
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constexpr const value_type &assume_value() const &noexcept
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{
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NoValuePolicy::narrow_value_check(static_cast<const basic_result_value_observers &>(*this));
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return this->_state._value; // NOLINT
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}
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constexpr value_type &&assume_value() && noexcept
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{
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NoValuePolicy::narrow_value_check(static_cast<basic_result_value_observers &&>(*this));
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return static_cast<value_type &&>(this->_state._value); // NOLINT
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}
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constexpr const value_type &&assume_value() const &&noexcept
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{
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NoValuePolicy::narrow_value_check(static_cast<const basic_result_value_observers &&>(*this));
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return static_cast<const value_type &&>(this->_state._value); // NOLINT
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}
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constexpr value_type &value() &
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{
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NoValuePolicy::wide_value_check(static_cast<basic_result_value_observers &>(*this));
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return this->_state._value; // NOLINT
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}
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constexpr const value_type &value() const &
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{
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NoValuePolicy::wide_value_check(static_cast<const basic_result_value_observers &>(*this));
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return this->_state._value; // NOLINT
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}
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constexpr value_type &&value() &&
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{
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NoValuePolicy::wide_value_check(static_cast<basic_result_value_observers &&>(*this));
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return static_cast<value_type &&>(this->_state._value); // NOLINT
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}
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constexpr const value_type &&value() const &&
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{
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NoValuePolicy::wide_value_check(static_cast<const basic_result_value_observers &&>(*this));
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return static_cast<const value_type &&>(this->_state._value); // NOLINT
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}
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};
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template <class Base, class NoValuePolicy> class basic_result_value_observers<Base, void, NoValuePolicy> : public Base
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{
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public:
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using Base::Base;
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constexpr void assume_value() const noexcept { NoValuePolicy::narrow_value_check(*this); }
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constexpr void value() const { NoValuePolicy::wide_value_check(*this); }
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};
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} // namespace detail
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BOOST_OUTCOME_V2_NAMESPACE_END
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#endif
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