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Python: Keep reference to owning container during element access

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This commit is contained in:
Jake Cobb 2018-04-18 17:28:31 -04:00
commit 65dd1c49bc
1 changed files with 18 additions and 0 deletions
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18
Lib/python/pycontainer.swg
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@ -36,6 +36,13 @@
%include <std_except.i> %include <std_except.i>
%fragment("container_owner_attribute", "header") {
PyObject* container_owner_attribute() {
static PyObject* name = SWIG_Python_str_FromChar("__owner");
return name;
}
}
%fragment(SWIG_Traits_frag(swig::SwigPtr_PyObject),"header",fragment="StdTraits") { %fragment(SWIG_Traits_frag(swig::SwigPtr_PyObject),"header",fragment="StdTraits") {
namespace swig { namespace swig {
template <> struct traits<SwigPtr_PyObject > { template <> struct traits<SwigPtr_PyObject > {
@ -766,6 +773,17 @@ namespace swig
size_type __len__() const { size_type __len__() const {
return self->size(); return self->size();
} }
%typemap(ret, fragment="container_owner_attribute") value_type& {
PyObject* swigThis = PyObject_GetAttrString($result, "this");
PyErr_Clear();
if (swigThis && SwigPyObject_Check(swigThis) &&
(reinterpret_cast<SwigPyObject*>(swigThis)->own & SWIG_POINTER_OWN) != SWIG_POINTER_OWN) {
// try to store reference to parent
PyObject_GenericSetAttr($result, container_owner_attribute(), $self);
}
Py_XDECREF(swigThis);
}
} }
%enddef %enddef