Void.h

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/*
 * This file is part of Algorithms library toolkit.
 * Copyright (C) 2017 Jan Travnicek (jan.travnicek@fit.cvut.cz)
 
 * Algorithms library toolkit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 
 * Algorithms library toolkit 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 General Public License for more details.
 
 * You should have received a copy of the GNU General Public License
 * along with Algorithms library toolkit.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <alib/string>
 
namespace object {
 
class Void {
public:
    explicit Void ( );
 
    std::strong_ordering operator <=> ( const Void & ) const {
        return std::strong_ordering::equal;
    }
 
    bool operator == ( const Void & ) const {
        return true;
    }
 
    friend std::ostream & operator <<( std::ostream & out, const Void & );
 
    static Void VOID;
 
};
 
} /* namespace object */