Changes between Version 33 and Version 34 of j2p

Timestamp:

06/22/23 11:13:41 (17 months ago)

Author:

wouter

Comment:

--

j2p

@@ -54 +54 @@
 
 If function calls in python deliver a wrong object (not matching the above mapping), the translator has to inject additional code to convert it to the proper object. For example, {{{Map.getKeys()}}} in python would be {{{set(map.keys())}}} where the extra {{{set}}} converts the dict_keys into a proper set.
+
+==== Inner classes
+Inner classes (classes inside classes) are **not supported**. You can not import, call or use inner classes. Inner classes can not be translated. This is for many reasons but the brief summary:
+* The useful variant of inner class is the non-static inner class. This class can access fields in the enclosing class.
+* Python does not support accessing fields of the enclosing class unless some tricks are applied. But these tricks would break uniformity of constructors.
+* Many deep technical reasons that largely complicate dealing with these.
+
+We recommend now:
+* manually override translation when you really need to call an inner class
+* use package-private classes to replace your own inner classes.
+* For the non-static inner class: pass the enclosing class as argument to the child class constructor. You may have to use more tricks to get around cyclic dependencies.
 
 ==== More notes: