Named.h

/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2001-2025 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
/// @file    Named.h
/// @author  Daniel Krajzewicz
/// @author  Jakob Erdmann
/// @date    Sept 2002
///
// Base class for objects which have an id.
/****************************************************************************/
#pragma once
#include <config.h>
#include <iostream>
#include <string>
#include <set>


/// @brief Function-object for stable sorting of objects acting like Named without being derived (SUMOVehicle)
// @note Numbers of different lengths will not be ordered by alphanumerical sorting
struct ComparatorIdLess {
    template<class T>
    bool operator()(const T* const a, const T* const b) const {
        return a->getID() < b->getID();
    }
};


/// @brief Function-object for stable sorting of objects with numerical ids
struct ComparatorNumericalIdLess {
    template<class T>
    bool operator()(const T* const a, const T* const b) const {
        return a->getNumericalID() < b->getNumericalID();
    }
};


// ===========================================================================
// class definitions
// ===========================================================================
/**
 * @class Named
 * @brief Base class for objects which have an id.
 */
class Named {
public:
    /** @brief Constructor
     * @param[in] id The id of the object
     */
    Named(const std::string& id) : myID(id) { }


    /// @brief Destructor
    virtual ~Named() { }

    /// @brief get an identifier for Named-like object which may be Null
    template<class T>
    static std::string getIDSecure(const T* obj, const std::string& fallBack = "NULL") {
        return obj == 0 ? fallBack : obj->getID();
    }

    /** @brief Returns the id
     * @return The stored id
     */
    const std::string& getID() const {
        return myID;
    }


    /** @brief resets the id
     * @param[in] newID The new id of this object
     */
    virtual void setID(const std::string& newID) {
        myID = newID;
    }


    /** @class StoringVisitor
     * @brief Allows to store the object; used as context while traveling the rtree in TraCI
     */
    class StoringVisitor {
    public:
        /// @brief Constructor
        StoringVisitor(std::set<const Named*>& objects) : myObjects(objects) {}

        /// @brief Destructor
        ~StoringVisitor() {}

        /// @brief Adds the given object to the container
        void add(const Named* const o) const {
            myObjects.insert(o);
        }

        /// @brief The container
        std::set<const Named*>& myObjects;

    private:
        /// @brief invalidated copy constructor
        StoringVisitor(const StoringVisitor& src);

        /// @brief invalidated assignment operator
        StoringVisitor& operator=(const StoringVisitor& src);
    };


    /** @brief Adds this object to the given container
     * @param[in, filled] cont The container to add this item to
     */
    void addTo(const StoringVisitor& cont) const {
        cont.add(this);
    }


protected:
    /// @brief The name of the object
    std::string myID;

};