Gui: implement '*' operator for weak pointer classes

src/Gui/DocumentObserver.cpp

@@ -278,7 +278,12 @@ bool DocumentWeakPtrT::expired() const noexcept
     return (d->_document == nullptr);
 }
 
-Gui::Document* DocumentWeakPtrT::operator->() noexcept
+Gui::Document* DocumentWeakPtrT::operator*() const noexcept
+{
+    return d->_document;
+}
+
+Gui::Document* DocumentWeakPtrT::operator->() const noexcept
 {
     return d->_document;
 }
@@ -378,7 +383,12 @@ ViewProviderWeakPtrT& ViewProviderWeakPtrT::operator= (ViewProviderDocumentObjec
     return *this;
 }
 
-ViewProviderDocumentObject* ViewProviderWeakPtrT::operator->() noexcept
+ViewProviderDocumentObject* ViewProviderWeakPtrT::operator*() const noexcept
+{
+    return d->get();
+}
+
+ViewProviderDocumentObject* ViewProviderWeakPtrT::operator->() const noexcept
 {
     return d->get();
 }

src/Gui/DocumentObserver.h

@@ -147,11 +147,16 @@ public:
      * \return true if the managed object has already been deleted, false otherwise.
      */
     bool expired() const noexcept;
+    /*!
+     * \brief operator *
+     * \return pointer to the document
+     */
+    Gui::Document* operator*() const noexcept;
     /*!
      * \brief operator ->
      * \return pointer to the document
      */
-    Gui::Document* operator->() noexcept;
+    Gui::Document* operator->() const noexcept;
 
 private:
     // disable
@@ -186,11 +191,16 @@ public:
      * Assignment operator
      */
     ViewProviderWeakPtrT& operator= (ViewProviderDocumentObject* p);
+    /*!
+     * \brief operator *
+     * \return pointer to the document
+     */
+    ViewProviderDocumentObject* operator*() const noexcept;
     /*!
      * \brief operator ->
      * \return pointer to the document
      */
-    ViewProviderDocumentObject* operator->() noexcept;
+    ViewProviderDocumentObject* operator->() const noexcept;
     /*!
      * \brief operator ==
      * \return true if both objects are equal, false otherwise
@@ -253,6 +263,13 @@ public:
         ptr = p;
         return *this;
     }
+    /*!
+     * \brief operator *
+     * \return pointer to the view provider
+     */
+    T* operator*() const {
+        return ptr.get<T>();
+    }
     /*!
      * \brief operator ->
      * \return pointer to the view provider