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ba3b561a40
There were some ideas about how to use this class but we never actually started using it, so let's just simplify it and get it ready for use. The basic idea is: a function returns a Result<ValueType, ErrorType>. Callers check if the result object is_error(). If so, an ErrorType can be fetched with the error() getter. Otherwise, a ValueType is fetched with the value() getter. That's it. :^)
92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Optional.h>
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namespace AK {
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template<typename ValueType, typename ErrorType>
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class Result {
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public:
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Result(const ValueType& res)
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: m_result(res)
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{
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}
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Result(const ErrorType& error)
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: m_error(error)
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{
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}
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Result(const ValueType& res, const ErrorType& error)
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: m_result(res)
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, m_error(error)
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{
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}
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Result(Result&& other)
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: m_result(move(other.m_result))
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, m_error(move(other.m_error))
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{
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}
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Result(Result& other)
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: m_result(other.m_result)
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, m_error(other.m_error)
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{
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}
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~Result()
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{
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}
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ValueType& value()
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{
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return m_result.value();
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}
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ErrorType& error()
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{
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return m_error.value();
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}
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bool is_error() const
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{
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return m_error.has_value();
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}
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private:
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Optional<ValueType> m_result;
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Optional<ErrorType> m_error;
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};
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}
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using AK::Result;
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