Add implicit conversion from imstkNew to std::weak_ptr

Source/Common/imstkNew.h

@@ -75,6 +75,11 @@ public:
     ///
     operator std::shared_ptr<T>() const { return object; }
 
+    ///
+    /// \brief Implicit conversion
+    ///
+    operator std::weak_ptr<T>() const { return object; }
+
     ///
     /// \brief Hack for multiple implicit conversions, does not work with overloads though
     /// as it won't know what to cast too
@@ -86,6 +91,17 @@ public:
         return std::dynamic_pointer_cast<U>(object);
     }
 
+    ///
+    /// \brief Hack for multiple implicit conversions, does not work with overloads though
+    /// as it won't know what to cast too
+    ///
+    template<typename U>
+    operator std::weak_ptr<U>() const
+    {
+      static_assert(std::is_base_of<U, T>::value, "Argument U type not compatible with imstkNew<T>'s T");
+      return std::dynamic_pointer_cast<U>(object);
+    }
+
 private:
     imstkNew(const imstkNew<T>&)       = delete;
     void operator=(const imstkNew<T>&) = delete;