add * and -> operators

git-svn-id: svn+q:///qpdf/trunk@1029 71b93d88-0707-0410-a8cf-f5a4172ac649

include/qpdf/PointerHolder.hh

@@ -124,6 +124,24 @@ class PointerHolder
 	    return this->data->refcount;
 	}
 
+    T const& operator*() const
+    {
+        return *this->data->pointer;
+    }
+    T& operator*()
+    {
+        return *this->data->pointer;
+    }
+
+    T const* operator->() const
+    {
+        return this->data->pointer;
+    }
+    T* operator->()
+    {
+        return this->data->pointer;
+    }
+
   private:
     void init(Data* data)
 	{

libtests/pointer_holder.cc

@@ -12,6 +12,7 @@ class Object
     Object();
     ~Object();
     void hello();
+    void hello() const;
 
   private:
     static int next_id;
@@ -38,8 +39,21 @@ Object::hello()
     std::cout << "calling Object::hello for " << this->id << std::endl;
 }
 
+void
+Object::hello() const
+{
+    std::cout << "calling Object::hello const for " << this->id << std::endl;
+}
+
 typedef PointerHolder<Object> ObjectHolder;
 
+void callHello(ObjectHolder const& oh)
+{
+    oh.getPointer()->hello();
+    oh->hello();
+    (*oh).hello();
+}
+
 int main(int argc, char* argv[])
 {
     std::list<ObjectHolder> ol1;
@@ -74,6 +88,9 @@ int main(int argc, char* argv[])
     }
 
     ol1.front().getPointer()->hello();
+    ol1.front()->hello();
+    (*ol1.front()).hello();
+    callHello(ol1.front());
     ol1.pop_front();
     std::cout << "goodbye" << std::endl;
     return 0;

libtests/qtest/ph/ph.out

@@ -7,6 +7,11 @@ equal okay
 less than okay
 created Object, id 3
 calling Object::hello for 1
+calling Object::hello for 1
+calling Object::hello for 1
+calling Object::hello const for 1
+calling Object::hello const for 1
+calling Object::hello const for 1
 goodbye
 destroyed Object, id 3
 destroyed Object, id 1