ladybird/AK/Result.h

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Platform.h>
#include <AK/Optional.h>
namespace AK {
template<typename T, typename E>
class CONSUMABLE(unknown) Result {
public:
RETURN_TYPESTATE(unknown)
Result(const T& res)
: m_result(res)
{}
RETURN_TYPESTATE(unknown)
Result(const E& error)
: m_error(error)
{
}
RETURN_TYPESTATE(unknown)
Result(const T& res, const E& error)
: m_result(res)
, m_error(error)
{
}
RETURN_TYPESTATE(unknown)
Result(Result&& other)
: m_result(move(other.m_result))
, m_error(move(other.m_error))
{
}
RETURN_TYPESTATE(unknown)
Result(Result& other)
: m_result(other.m_result)
, m_error(other.m_error)
{
}
CALLABLE_WHEN("unknown", "consumed")
~Result()
{}
CALLABLE_WHEN(consumed)
T& unwrap() {
return m_result.value();
}
CALLABLE_WHEN(consumed)
E& error() {
return m_error.value();
}
bool has_error() const {
return m_error.has_value();
}
bool has_value() const {
return m_result.has_value();
}
SET_TYPESTATE(consumed)
bool failed() const {
return m_error.value().failed();
}
private:
Optional<T> m_result;
Optional<E> m_error;
};
}
using AK::Result;