/usr/share/doc/swig4.0-examples/Examples/test-suite/director_ref.i

%module(directors="1") director_ref

%{
#include <string>

class Foo {
public:
        Foo(int i = -1) : count(0) {}
        virtual void OnDelete() {}
        virtual ~Foo() {}
        virtual std::string Msg(std::string msg = "default") { return "Foo-" + msg; }

        std::string GetMsg() { return Msg(); }
        std::string GetMsg(std::string msg) { return Msg(msg); }

        void Ref() { ++count; }
        void Unref() { --count; if (count == 0) { OnDelete(); delete this; } }
        int GetRefCount() { return count; }
private:
        int count;
};

class FooPtr {
public:
        FooPtr(Foo* f = NULL) : my_f(f) { if (my_f) { my_f->Ref(); } }
        ~FooPtr() { if (my_f) { my_f->Unref(); } }
        void Reset(Foo* f = NULL) {
                if (f) { f->Ref(); }
                if (my_f) { my_f->Unref(); }
                my_f = f;
        }
        int GetOwnedRefCount() {
                if (my_f) { return my_f->GetRefCount(); }
                return 0;
        }

private:
        Foo* my_f;
};

%}

%include <std_string.i>

%feature("director") Foo;
%feature("ref") Foo "$this->Ref();"
%feature("unref") Foo "$this->Unref();"

class Foo {
public:
        Foo(int i = -1) : count(0) {}
        virtual void OnDelete() {}
        virtual ~Foo() {}
        virtual std::string Msg(std::string msg = "default") { return "Foo-" + msg; }

        std::string GetMsg() { return Msg(); }
        std::string GetMsg(std::string msg) { return Msg(msg); }

        void Ref() { ++count; }
        void Unref() { --count; if (count == 0) { OnDelete(); delete this; } }
        int GetRefCount() { return count; }
private:
        int count;
};

class FooPtr {
public:
        FooPtr(Foo* f = NULL) : my_f(f) { if (my_f) { my_f->Ref(); } }
        ~FooPtr() { if (my_f) { my_f->Unref(); } }
        void Reset(Foo* f = NULL) {
                if (f) { f->Ref(); }
                if (my_f) { my_f->Unref(); }
                my_f = f;
        }
        int GetOwnedRefCount() {
                if (my_f) { return my_f->GetRefCount(); }
                return 0;
        }

private:
        Foo* my_f;
};

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