[Swig-devel] [ swig-Bugs-1746818 ] Directors bug with virtual protected methods

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Bugs item #1746818, was opened at 2007-07-03 00:00
Message generated for change (Comment added) made by berserker_r
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https://sourceforge.net/tracker/?func=detail&atid=101645&aid=1746818&group_id=1645

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Category: csharp
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Berserker (berserker_r)
Assigned to: William Fulton (wsfulton)
Summary: Directors bug with virtual protected methods

Initial Comment:
// C++ code

%feature("director") Alfa;
class Alfa
{
public:
  Alfa() { }
  virtual ~Alfa() { }
  
protected:
  virtual void test() { }
};

%feature("director") Beta;
class Beta : public Alfa
{
public:
  Beta() { }
  virtual ~Beta() { }
};

// C# code

public class Gamma : Beta
{
  public Gamma() { }
  public void foo()
  {
    test();
  }
}

public static class Program
{
  static void Run()
  {
    Gamma g = new Gamma();
    g.foo();
  }
}

The "foo" call causes an access violation in the C++ code generated by swig, in particular the problem is here:

SWIGEXPORT void SWIGSTDCALL CSharp_Alfa_testSwigExplicitAlfa(void *jarg1) {
  Alfa *arg1 = (Alfa *) 0 ;
  SwigDirector_Alfa *darg = 0;
  
  arg1 = (Alfa *)jarg1;
  darg = dynamic_cast<SwigDirector_Alfa *>(arg1);
  (darg)->testSwigPublic();
}

arg1 is a SwigDirector_Beta instance (not SwigDirector_Alfa) so the
dynamic_cast here returns null and the "testSwigPublic" call causes an access violation.

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>Comment By: Berserker (berserker_r)
Date: 2007-10-23 20:18

Message:
Logged In: YES 
user_id=418740
Originator: YES

4 months and no patches yet...any hope?

----------------------------------------------------------------------

Comment By: soccia79 (soccia79)
Date: 2007-10-23 13:28

Message:
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user_id=1836240
Originator: NO

Plz help!

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Comment By: soccia79 (soccia79)
Date: 2007-10-22 13:47

Message:
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I tried the la svn revision but the problem persists!
Always the same cast error as berserker_r reported:
SWIGEXPORT void SWIGSTDCALL CSharp_Alfa_testSwigExplicitAlfa(void *jarg1)
{
Alfa *arg1 = (Alfa *) 0 ;
SwigDirector_Alfa *darg = 0;

arg1 = (Alfa *)jarg1;
darg = dynamic_cast<SwigDirector_Alfa *>(arg1);      // crash here because
arg1 is a SwigDirector_Beta instance
(darg)->testSwigPublic();
}


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Comment By: Olly Betts (olly)
Date: 2007-10-19 14:59

Message:
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This sounds like it could be related to bug#1735931 which has been fixed
in SVN HEAD:

http://sourceforge.net/tracker/index.php?func=detail&aid=1735931&group_id=1645&atid=101645

Can you check the latest SVN HEAD and let us know if this is fixed/still
present?

----------------------------------------------------------------------

Comment By: soccia79 (soccia79)
Date: 2007-10-19 12:47

Message:
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user_id=1836240
Originator: NO

Plz fix this bug!

----------------------------------------------------------------------

Comment By: soccia79 (soccia79)
Date: 2007-07-26 17:42

Message:
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user_id=1836240
Originator: NO

News about this bug?

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Comment By: soccia79 (soccia79)
Date: 2007-07-04 17:42

Message:
Logged In: YES 
user_id=1836240
Originator: NO

Plz fix this bug, I have the same problem!!! (I'm using last SVN)

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101645&aid=1746818&group_id=1645