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56a6d7924e
It's much easier to ask for T::ValueType than for RemoveReference<decltype(declval<T>().release_value())>
117 lines
1.9 KiB
C++
117 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 ValueT, typename ErrorT>
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class [[nodiscard]] Result {
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public:
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using ValueType = ValueT;
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using ErrorType = ErrorT;
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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(ValueType&& res)
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: m_result(move(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(ErrorType&& error)
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: m_error(move(error))
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{
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}
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Result(Result&& other) = default;
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Result(const Result& other) = default;
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~Result() = default;
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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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ValueType release_value()
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{
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return m_result.release_value();
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}
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ErrorType release_error()
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{
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return m_error.release_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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// Partial specialization for void value type
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template<typename ErrorT>
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class [[nodiscard]] Result<void, ErrorT> {
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public:
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using ValueType = void;
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using ErrorType = ErrorT;
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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(ErrorType&& error)
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: m_error(move(error))
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{
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}
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Result() = default;
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Result(Result&& other) = default;
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Result(const Result& other) = default;
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~Result() = default;
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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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ErrorType release_error()
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{
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return m_error.release_value();
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}
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private:
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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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