support classes in addition to functions for views

docs/_themes

@@ -1 +0,0 @@
-Subproject commit 3d964b660442e23faedf801caed6e3c7bd42d5c9

flask/app.py

@@ -507,8 +507,8 @@ class Flask(_PackageBoundObject):
         :param endpoint: the endpoint for the registered URL rule.  Flask
                          itself assumes the name of the view function as
                          endpoint
-        :param view_func: the function to call when serving a request to the
-                          provided endpoint
+        :param view_func: the function, or class, to call when serving a request to the
+                          provided endpoint.
         :param options: the options to be forwarded to the underlying
                         :class:`~werkzeug.routing.Rule` object.  A change
                         to Werkzeug is handling of method options.  methods
@@ -708,7 +708,10 @@ class Flask(_PackageBoundObject):
             if rule.provide_automatic_options and req.method == 'OPTIONS':
                 return self.make_default_options_response()
             # otherwise dispatch to the handler for that endpoint
-            return self.view_functions[rule.endpoint](**req.view_args)
+            view_function = self.view_functions[rule.endpoint]
+            if isinstance(view_function, type):
+                view_function = view_function()
+            return view_function(**req.view_args)
         except HTTPException, e:
             return self.handle_http_exception(e)