Swig + Python + C++ + overloading + None = SEGV.

Hello,

I just noticed that if you pass None from Python to an overloaded C++
function as the argument overloading resolution is based on, you will
probably crash the interpreter.  The reason is that it uses
SWIG_ConvertPtr for typechecking and that will always succeed on None,
converting it to a null pointer, which usually gets dereferenced later.

Example:
----8<----
%module oltest

%{
#include <iostream>
using namespace std;
%}

%inline %{
struct foo {
  int x;
};
struct bar {
  float y;
};

static void
foobar( foo x) {
  cout << "foo " << x.x << endl;
}

static void
foobar( bar x) {
  cout << "bar " << x.y << endl;
}
%}
---->8----
Compile and import to Python, then try oltest.foobar( None).

-- 
        Timo Korvola            <URL:http://www.iki.fi/tkorvola>
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