/*
* opencog/atoms/core/TypeIntersectionLink.h
*
* Copyright (C) 2020 Linas Vepstas
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License v3 as
* published by the Free Software Foundation and including the exceptions
* at http://opencog.org/wiki/Licenses
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, write to:
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _OPENCOG_TYPE_INTERSECTION_H
#define _OPENCOG_TYPE_INTERSECTION_H
#include "TypeChoice.h"
namespace opencog
{
/** \addtogroup grp_atomspace
* @{
*/
/// The TypeIntersectionLink link is used to hold a type description; it is
/// an anonymous (un-named) type that is an intersection of everything
/// it holds. It's primary use is for specifying typed glob intervals,
/// although it is also intended for computing the intersection of types.
///
/// This class computes the intersection of two types:
/// `(TypeIntersectionLink (TypeChoice stuff) (TypeChoice other-stuff))`
///
/// For type-union, use
/// `(TypeChoice (TypeChoice stuff) (TypeChoice other-stuff))`
///
class TypeIntersectionLink : public TypeChoice
{
protected:
void init(bool);
void analyze(Handle, bool&);
public:
TypeIntersectionLink(const HandleSeq&&, Type=TYPE_INTERSECTION_LINK, bool=false);
TypeIntersectionLink(const TypeIntersectionLink&) = delete;
TypeIntersectionLink& operator=(const TypeIntersectionLink&) = delete;
static Handle factory(const Handle&);
};
LINK_PTR_DECL(TypeIntersectionLink)
#define createTypeIntersectionLink CREATE_DECL(TypeIntersectionLink)
/** @}*/
}
#endif // _OPENCOG_TYPE_INTERSECTION_H