/usr/share/doc/swig4.0-examples/Examples/ruby/free_function/example.i

%module example

%{
#include "example.h"
%}

/* Specify that ownership is transferred to the zoo
        when calling add_animal */
%apply SWIGTYPE *DISOWN { Animal* animal };

/* Track objects */
%trackobjects;

/* Specify the mark function */
%freefunc Zoo "free_Zoo";

%include "example.h"

%header %{
        static void free_Zoo(void* ptr) {
                Zoo* zoo = (Zoo*) ptr;

                /* Loop over each object and call SWIG_RubyRemoveTracking */
                int count = zoo->get_num_animals();

                for(int i = 0; i < count; ++i) {
                        /* Get an animal */
                        Animal* animal = zoo->get_animal(i);
                        /* Unlink the Ruby object from the C++ object */
                        SWIG_RubyUnlinkObjects(animal);
                        /* Now remove the tracking for this animal */
                        SWIG_RubyRemoveTracking(animal);
                }

           /* Now call SWIG_RubyRemoveTracking for the zoo */
                SWIG_RubyRemoveTracking(ptr);

                /* Now free the zoo which will free the animals it contains */
                delete zoo;
        }
%}

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