/*
* opencog/atoms/constrain/AlphaEqualLink.h
*
* Copyright (C) 2025 BrainyBlaze Dynamics LLC
* 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_ALPHA_EQUAL_LINK_H
#define _OPENCOG_ALPHA_EQUAL_LINK_H
#include <opencog/atoms/execution/EvaluatableLink.h>
namespace opencog
{
/** \addtogroup grp_atomspace
* @{
*/
/**
* The AlphaEqualLink checks for alpha-equivalence between two atoms.
* Two atoms are alpha-equivalent if they are structurally identical
* after variable renaming (alpha-conversion).
*
* For example, (Lambda (Variable "x") (Concept "foo"))
* is alpha-equivalent to (Lambda (Variable "y") (Concept "foo"))
* because the bound variables can be renamed without changing meaning.
*/
class AlphaEqualLink : public EvaluatableLink
{
protected:
virtual void setAtomSpace(AtomSpace*);
public:
AlphaEqualLink(const HandleSeq&&, Type=ALPHA_EQUAL_LINK);
AlphaEqualLink(const AlphaEqualLink&) = delete;
AlphaEqualLink& operator=(const AlphaEqualLink&) = delete;
virtual bool bevaluate(AtomSpace*, bool silent=false);
static Handle factory(const Handle&);
};
LINK_PTR_DECL(AlphaEqualLink)
#define createAlphaEqualLink CREATE_DECL(AlphaEqualLink)
/** @}*/
}
#endif // _OPENCOG_ALPHA_EQUAL_LINK_H