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UTL STL container descriptor checks

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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;
    }
  };
This commit is contained in:
William S Fulton 2016-07-28 08:31:03 +01:00
commit 91aba9f719
18 changed files with 53 additions and 41 deletions
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3
Lib/python/pystdcommon.swg
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@ -46,7 +46,8 @@ namespace swig {
struct traits_asptr {
static int asptr(PyObject *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;
}