Literal.h

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/*
 * Souffle - A Datalog Compiler
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved
 * Licensed under the Universal Permissive License v 1.0 as shown at:
 * - https://opensource.org/licenses/UPL
 * - <souffle root>/licenses/SOUFFLE-UPL.txt
 */
 
/************************************************************************
 *
 * @file Literal.h
 *
 * Defines the literal class
 *
 ***********************************************************************/
 
#pragma once
 
#include "ast/Node.h"
 
namespace souffle::ast {
 
/**
 * @class Literal
 * @brief Defines an abstract class for literals in a horn clause.
 *
 * Literals can be atoms, binary relations, and negated atoms
 * in the body and head of a clause.
 */
class Literal : public Node {
public:
    using Node::Node;
 
    Literal* clone() const override = 0;
};
 
}  // namespace souffle::ast