Python バインディングを書いてみよう

class Icecream

{

public:

    Icecream(const std::string &flavor);

    virtual Icecream *clone();

    virtual ~Icecream();

    virtual const std::string getFlavor();
private:

    std::string m_flavor;

};

class Truck {

public:

    Truck(bool leaveOnDestruction = false);

    Truck(const Truck &other);

    Truck& operator=(const Truck &other);

    ~Truck();
    void addIcecreamFlavor(Icecream *icecream);

    void printAvailableFlavors() const;
    bool deliver() const;

    void arrive() const;

    void leave() const;
    void setLeaveOnDestruction(bool value);

    void setArrivalMessage(const std::string &message);
private:

    void clearFlavors();
    bool m_leaveOnDestruction = false;

    std::string m_arrivalMessage = "A new icecream truck has arrived!\n";

    std::vector<Icecream *icecream> m_flavors;

};

#ifndef BINDINGS_H

#define BINDINGS_H

#include "icecream.h"

#include "truck.h"

#endif // BINDINGS_H

<?xml version="1.0"?>

<typesystem package="Universe">

    <primitive-type name="bool"/>

    <primitive-type name="std::string"/>

    <object-type name="Icecream">

        <modify-function signature="clone()">

            <modify-argument index="0">

                <define-ownership owner="c++"/>

            </modify-argument>

        </modify-function>

    </object-type>

    <value-type name="Truck">

        <modify-function signature="addIcecreamFlavor(Icecream*)">

            <modify-argument index="1">

                <define-ownership owner="c++"/>

            </modify-argument>

        </modify-function>

    </value-type>

</typesystem>

from Universe import Icecream, Truck
class VanillaChocolateIcecream(Icecream):

    def __init__(self, flavor=""):

        super(VanillaChocolateIcecream, self).__init__(flavor)
    def clone(self):

        return VanillaChocolateIcecream(self.getFlavor())
    def getFlavor(self):

        return "vanilla sprinked with chocolate"
class VanillaChocolateCherryIcecream(VanillaChocolateIcecream):

    def __init__(self, flavor=""):

        super(VanillaChocolateIcecream, self).__init__(flavor)
    def clone(self):

        return VanillaChocolateCherryIcecream(self.getFlavor())
    def getFlavor(self):

        base_flavor = super(VanillaChocolateCherryIcecream, self).getFlavor()

        return base_flavor + " and a cherry"
if __name__ == '__main__':

    leave_on_destruction = True

    truck = Truck(leave_on_destruction)
    flavors = ["vanilla", "chocolate", "strawberry"]

    for f in flavors:

        icecream = Icecream(f)

        truck.addIcecreamFlavor(icecream)
    truck.addIcecreamFlavor(VanillaChocolateIcecream())

    truck.addIcecreamFlavor(VanillaChocolateCherryIcecream())
    truck.arrive()

    truck.printAvailableFlavors()

    result = truck.deliver()
    if result:

        print("All the kids got some icecream!")

    else:

        print("Aww, someone didn't get the flavor they wanted...")
    if not result:

        special_truck = Truck(truck)

        del truck
        print("")

        special_truck.setArrivalMessage("A new SPECIAL icecream truck has arrived!\n")

        special_truck.arrive()

        special_truck.addIcecreamFlavor(Icecream("SPECIAL *magical* icecream"))

        special_truck.printAvailableFlavors()

        special_truck.deliver()

        print("Now everyone got the flavor they wanted!")

        special_truck.leave()