added refcount example using the old macro way and the proposed ref/unref features

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@5667 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/refcount.i

@@ -0,0 +1,116 @@
+%module refcount
+
+#pragma SWIG nowarn=362
+%{ 
+#include <iostream> 
+#include "refcount.h"
+%}
+
+#if 1
+//
+// the old macro way
+//
+%define RefCount(...)
+  %typemap(newfree) __VA_ARGS__* { $1->ref(); }
+  %newobject __VA_ARGS__::clone();
+  %extend __VA_ARGS__ { ~__VA_ARGS__() { self->unref(); } }
+  %ignore __VA_ARGS__::~__VA_ARGS__();
+%enddef
+//
+// you need to apply the RefCount macro to all the RCObj derived
+// classes.
+//
+RefCount(RCObj);
+RefCount(A);
+RefCount(A1);
+RefCount(A2);
+RefCount(A3);
+RefCount(B);
+
+#else
+//
+// using the ref/unref features you can active the ref. counting
+// for RCObj and all its descendents at once
+//
+%feature("refbase")   RCObj "$this->ref();"
+%feature("unrefbase") RCObj "$this->unref();"
+
+#endif
+
+%include "refcount.h"
+
+%newobject B::create();
+%newobject B::cloner();
+
+%inline %{
+
+  struct A : RCObj
+  {
+    A() {}
+    
+    ~A() 
+    {
+      // std::cout << "deleting a" << std::endl;
+    }
+
+#ifdef SWIGRUBY 
+    // fix strange ruby + virtual derivation problem
+    using RCObjBase::ref_count;
+#endif
+  };
+
+  struct A1 : A 
+  {
+  protected:
+    A1() {}
+  };
+
+  struct A2 : A
+  {
+  };
+
+  struct A3 : A1, private A2
+  {    
+  };
+  
+  struct B : RCObj
+  {
+    B(A* a) : _a(a) {}
+    
+    static B* create(A* a)
+    {
+      return new B(a);
+    }
+    
+    B* cloner() 
+    {
+      return new B(_a);
+    }
+
+    ~B() 
+    {
+      // std::cout << "deleting b" << std::endl;
+    }
+
+  private:
+    RCPtr<A> _a;
+  };
+
+%}
+
+
+/* Other ref/unref uses:
+
+// deactive the refcounting for A1 
+%feature("noref")   A1;
+%feature("nounref") A1;
+
+// deactive the refcounting for A2 and all its descendents 
+%feature("norefbase")   A2;
+%feature("nounrefbase") A2;
+
+// active the refcounting only for A3 
+%feature("ref")   A3 { $this->ref(); }     
+%feature("unref") A3 { $this->unref(); }
+
+*/