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c4edb9f6c2
The goal with these is to eventually replace AK::Result, KResult and KResultOr<T> with something that works (and makes sense) in both kernel and userspace. This first cut of Error can be made from an errno code, or from a string literal (StringView)
120 lines
2.5 KiB
C++
120 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021, 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/Format.h>
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#if defined(__serenity__) && defined(KERNEL)
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# include <LibC/errno_numbers.h>
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#else
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# include <errno.h>
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#endif
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namespace AK {
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class Error {
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public:
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static Error from_errno(int code) { return Error(code); }
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static Error from_string_literal(StringView string_literal) { return Error(string_literal); }
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bool is_errno() const { return m_code != 0; }
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int code() const { return m_code; }
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StringView string_literal() const { return m_string_literal; }
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private:
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Error(int code)
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: m_code(code)
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{
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}
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Error(StringView string_literal)
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: m_string_literal(string_literal)
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{
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}
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int m_code { 0 };
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StringView m_string_literal;
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};
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template<typename T>
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class [[nodiscard]] ErrorOr {
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public:
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ErrorOr(T const& value)
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: m_value(value)
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{
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}
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ErrorOr(T&& value)
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: m_value(move(value))
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{
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}
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ErrorOr(ErrnoCode errno)
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: m_error(Error::from_errno(errno))
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{
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}
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ErrorOr(Error&& error)
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: m_error(move(error))
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{
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}
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ErrorOr(ErrorOr&& other) = default;
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ErrorOr(ErrorOr const& other) = default;
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~ErrorOr() = default;
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T& value() { return m_value.value(); }
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Error& error() { return m_error.value(); }
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bool is_error() const { return m_error.has_value(); }
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T release_value() { return m_value.release_value(); }
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Error release_error() { return m_error.release_value(); }
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private:
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Optional<T> m_value;
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Optional<Error> m_error;
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};
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// Partial specialization for void value type
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template<>
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class [[nodiscard]] ErrorOr<void> {
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public:
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ErrorOr(Error error)
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: m_error(move(error))
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{
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}
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ErrorOr() = default;
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ErrorOr(ErrorOr&& other) = default;
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ErrorOr(const ErrorOr& other) = default;
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~ErrorOr() = default;
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Error& error() { return m_error.value(); }
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bool is_error() const { return m_error.has_value(); }
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Error release_error() { return m_error.release_value(); }
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private:
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Optional<Error> m_error;
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};
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template<>
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struct Formatter<Error> : Formatter<FormatString> {
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void format(FormatBuilder& builder, Error const& error)
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{
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if (error.is_errno())
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return Formatter<FormatString>::format(builder, "Error(errno={})", error.code());
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return Formatter<FormatString>::format(builder, "Error({})", error.string_literal());
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}
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};
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}
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using AK::ErrorOr;
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