minetest.git - modified minetest for gpcfs purposes

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/*
Minetest
Copyright (C) 2021  rubenwardy

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include <utility>
#include "debug.h"

struct nullopt_t
{
};
constexpr nullopt_t nullopt{};

/**
 * An implementation of optional for C++11, which aims to be
 * compatible with a subset of std::optional features.
 *
 * Unfortunately, Minetest doesn't use C++17 yet.
 *
 * @tparam T The type to be stored
 */
template <typename T>
class Optional
{
	bool m_has_value = false;
	T m_value;

public:
	Optional() noexcept {}
	Optional(nullopt_t) noexcept {}


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