Try to fix bool(wxWindow)

Author: amauryfa

cffi/wrapper_lib/cppwrapper.py

@@ -340,6 +340,9 @@ def forget_ptr(ptr):
         _detach_children(obj)
         # TODO: does obj need to detach from its parent too?
 
+def is_alive(obj):
+    return bool(obj._cpp_obj)
+
 def take_ownership(obj):
     if obj is None:
         return

etg/window.py

@@ -158,14 +158,14 @@ def run():
     #endif
     """)
 
+    # TODO(amauryfa): platform-independent version?
     c.addPyMethod('__nonzero__', '(self)',
         doc="Can be used to test if the C++ part of the window still exists, with \n"
             "code like this::\n\n"
             "    if theWindow:\n"
             "        doSomething()",
         body="""\
-        import wx.siplib
-        return not wx.siplib.isdeleted(self)
+        return wrapper_lib.is_alive(self)
         """)
     c.addPyCode('Window.__bool__ = Window.__nonzero__') # For Python 3