OwnedPtr, SharedPtr: Add operator bool

luna/include/luna/OwnedPtr.h

@@ -59,6 +59,11 @@ template <typename T> class OwnedPtr
         return *m_ptr;
     }
 
+    operator bool() const
+    {
+        return m_ptr != nullptr;
+    }
+
     template <typename Type> friend Result<SharedPtr<Type>> adopt_shared_from_owned(OwnedPtr<Type>&&);
 
   private:

luna/include/luna/SharedPtr.h

@@ -99,6 +99,11 @@ template <typename T> class SharedPtr
         return *m_ptr;
     }
 
+    operator bool() const
+    {
+        return m_ptr != nullptr;
+    }
+
   private:
     T* m_ptr;
     RefCount* m_ref_count;