[Swig-devel] [ swig-Bugs-2826403 ] Named objects in function calls return additional arguments

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Bugs item #2826403, was opened at 2009-07-24 06:53
Message generated for change (Tracker Item Submitted) made by auriocus
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Category: tcl
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Christian Gollwitzer (auriocus)
Assigned to: Nobody/Anonymous (nobody)
Summary: Named objects in function calls return additional arguments

Initial Comment:
When a C-function with return type void is called which accepts a reference to a class, the return list has an additional argument, when it is called with a named object as opposed to a pointer:

Assume a class s and a function void change_s(s&)

(swigbug) 56 % s news 120
_e0db3301_p_s
(swigbug) 57 % change_s [new_s cget -this]
(swigbug) 58 % change_s new_s
_10a03301_p_s

While this is harmless with real void functions, it becomes problematic when the function returns by a pointer:
void return_by_typemap(s& the_s, int *OUTPUT)

(swigbug) 59 % return_by_typemap [new_s cget -this]
5
(swigbug) 60 % return_by_typemap new_s
_10a03301_p_s 5
(swigbug) 61 % 95-88-123-251-dynip:swigbug chris$ 

The problem is, that interp->result is not cleaned after the conversion in SWIG_Tcl_ConvertPtrFromString

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101645&aid=2826403&group_id=1645