UTL STL container descriptor checks

The vector of pointers (just fixed) were not working correctly because the
descriptors returned from swig::type_info() were sometimes returning
zero. Zero should only be used for void * as the subsequent call to
SWIG_ConvertPtr will blindly cast the pointer without checking
descriptor.

std::vector<void *> does not work and will require further changes:
specializing traits_info<void *> to return 0 and traits_asptr<void *>.
I tried this and traits_asptr<void> also needs to be added in which
seems odd and requires further investigation...

Lib/python/pystdcommon.swg:
  template <> struct traits_info<void *> {
    static swig_type_info *type_info() {
      static swig_type_info *info = 0;
    }
  };

Lib/std/std_common.i:
  template <>
  struct traits_asptr<void *> {
    static int asptr(PyObject *obj, void ***val) {
      void **p;
      swig_type_info *descriptor = 0;
      int res = SWIG_ConvertPtr(obj, (void **)&p, descriptor, 0);
      if (SWIG_IsOK(res)) {
	if (val) *val = p;
      }
      return res;
    }
  };

  // this is needed, but am not sure this is expected
  template <>
  struct traits_asptr<void> {
    static int asptr(PyObject *obj, void **val) {
      void **p;
      swig_type_info *descriptor = 0;
      int res = SWIG_ConvertPtr(obj, (void **)&p, descriptor, 0);
      if (SWIG_IsOK(res)) {
	if (val) *val = p;
      }
      return res;
    }
  };

1 files changed, 2 insertions, 1 deletions

diff --git a/Lib/scilab/scistdcommon.swg b/Lib/scilab/scistdcommon.swg
index 7fdc72212..63f3ca164 100644
--- a/Lib/scilab/scistdcommon.swg
+++ b/Lib/scilab/scistdcommon.swg
@@ -42,7 +42,8 @@ namespace swig {
   struct traits_asptr {
     static int asptr(const SwigSciObject& obj, Type **val) {
       Type *p;
-      int res = SWIG_ConvertPtr(obj, (void**)&p, type_info<Type>(), 0);
+      swig_type_info *descriptor = type_info<Type>();
+      int res = descriptor ? SWIG_ConvertPtr(obj, (void **)&p, descriptor, 0) : SWIG_ERROR;
       if (SWIG_IsOK(res)) {
 	if (val) *val = p;
       }