Counter.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 Counter.h
 *
 * Defines a counter functor class
 *
 ***********************************************************************/
 
#pragma once
 
#include "ast/Argument.h"
#include <ostream>
 
namespace souffle::ast {
 
/**
 * @class Counter
 * @brief counter functor (incrementing a value after each invocation)
 */
class Counter : public Argument {
public:
    using Argument::Argument;
 
    Counter* clone() const override {
        return new Counter(getSrcLoc());
    }
 
protected:
    void print(std::ostream& os) const override {
        os << "$";
    }
};
 
}  // namespace souffle::ast