maybe.hpp
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maybe.hpp
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	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#pragma once
	#include "libkazv-config.hpp"

	#include <string>
	#include <optional>

	namespace Kazv
	{
	class NotBut
	{
	std::string m_reason;
	public:
	explicit NotBut(std::string r) : m_reason(r) {}
	std::string reason() const { return m_reason; }
	};

	template<class T>
	class Maybe : public std::optional<T>
	{
	std::string m_reason;
	using BaseT = std::optional<T>;
	public:
	Maybe(T x) : BaseT(x) {}
	Maybe(NotBut r) : BaseT(), m_reason(r.reason()) {}

	std::string reason() const { return m_reason; }
	};

	using MaybeString = Maybe<std::string>;
	}