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// Begin License:
// Copyright (C) 2006-2011 Tobias Sargeant (tobias.sargeant@gmail.com).
// All rights reserved.
//
// This file is part of the Carve CSG Library (http://carve-csg.com/)
//
// This file may be used under the terms of the GNU General Public
// License version 2.0 as published by the Free Software Foundation
// and appearing in the file LICENSE.GPL2 included in the packaging of
// this file.
//
// This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
// INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE.
// End:
#pragma once
#include <carve/carve.hpp>
namespace carve {
class tagable {
private:
static int s_count;
protected:
mutable int __tag;
public:
tagable(const tagable &) : __tag(s_count - 1) { }
tagable &operator=(const tagable &) { return *this; }
tagable() : __tag(s_count - 1) { }
void tag() const { __tag = s_count; }
void untag() const { __tag = s_count - 1; }
bool is_tagged() const { return __tag == s_count; }
bool tag_once() const { if (__tag == s_count) return false; __tag = s_count; return true; }
static void tag_begin() { s_count++; }
};
}
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