Operation.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 Operation.h
 *
 * Defines the Operation of a relational algebra query.
 *
 ***********************************************************************/
 
#pragma once
 
#include "ram/Node.h"
#include <iosfwd>
 
namespace souffle::ram {
 
/**
 * @class Operation
 * @brief Abstract class for a relational algebra operation
 */
class Operation : public Node {
public:
    Operation* clone() const override = 0;
 
protected:
    void print(std::ostream& os) const override {
        print(os, 0);
    }
    /** @brief Pretty print with indentation */
    virtual void print(std::ostream& os, int tabpos) const = 0;
 
    /** @brief Pretty print jump-bed */
    static void print(const Operation* operation, std::ostream& os, int tabpos) {
        operation->print(os, tabpos);
    }
 
    friend class Query;
};
 
}  // namespace souffle::ram