NilConstant.h

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/*
 * Souffle - A Datalog Compiler
 * Copyright (c) 2013, 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 NilConstant.h
 *
 * Defines Nil constant class
 *
 ***********************************************************************/
 
#pragma once
 
#include "ast/Constant.h"
#include "parser/SrcLocation.h"
#include <string>
#include <utility>
 
namespace souffle::ast {
 
/**
 * @class NilConstant
 * @brief Defines the nil constant
 */
class NilConstant : public Constant {
public:
    NilConstant(SrcLocation loc = {}) : Constant("nil", std::move(loc)) {}
 
    NilConstant* clone() const override {
        return new NilConstant(getSrcLoc());
    }
};
 
}  // namespace souffle::ast