[pygccxml-commit] SF.net SVN: pygccxml: [523] pyplusplus_dev/docs/peps/ function_transformation.rest

[<rom...@us...>]

Revision: 523
          http://svn.sourceforge.net/pygccxml/?rev=523&view=rev
Author:   roman_yakovenko
Date:     2006-09-05 12:14:44 -0700 (Tue, 05 Sep 2006)

Log Message:
-----------
adding ouput_arg example

Modified Paths:
--------------
    pyplusplus_dev/docs/peps/function_transformation.rest

Modified: pyplusplus_dev/docs/peps/function_transformation.rest
===================================================================
--- pyplusplus_dev/docs/peps/function_transformation.rest	2006-09-05 12:33:56 UTC (rev 522)
+++ pyplusplus_dev/docs/peps/function_transformation.rest	2006-09-05 19:14:44 UTC (rev 523)
@@ -194,7 +194,38 @@
 create or give a hint to the user what transformation could\\should be applied
 on the function.
 
+-------------------------------------
+output_arg transformation example
+-------------------------------------
+::
 
+  class output_arg_t( transformer_t ):
+      def __init__( self, ordinal ):
+          self.ordinal = ordinal
+
+      def check( self, decl ):
+          if len( decl.arguments ) <= self.ordinal:
+              return user message
+          type_ = decl.arguments[self.ordinal].type
+          if not reference to immutable type:
+              raise user message
+
+      def signature_changes( self, decl ):
+          assert not self.check( decl )
+          return [ remove_arg( self.ordinal )
+                   , add_var_to_return_value( decl.arguments[ self.ordinal ].name ]
+    
+      def apply( self, sm ):
+          if sm is wrapper around C++ function:
+              sm. add declaration of variable type = decl.arguments[ self.ordinal ].type
+                  and name = decl.arguments[ self.ordinal ].type and initial value
+              sm. add variable to return expression.
+          else: #sm is a wrapper around Python function
+              sm. extract value from the tuple and assign it to the argument
+
+  def output_arg( ordinal ):
+      return output_arg_t( ordinal )
+
 -----------------
 Problems to solve
 -----------------


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.