From b72703acdf42ce0939737ed73ca4830c1e1b6b2d Mon Sep 17 00:00:00 2001
From: William S Fulton <wsf@fultondesigns.co.uk>
Date: Sat, 1 Apr 2023 21:57:34 +0100
Subject: STL support for copying Python objects supporting Iterator protocol

std::array not working though
---
 Lib/python/pycontainer.swg | 69 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 68 insertions(+), 1 deletion(-)

diff --git a/Lib/python/pycontainer.swg b/Lib/python/pycontainer.swg
index 4910fecc0..a1affa86b 100644
--- a/Lib/python/pycontainer.swg
+++ b/Lib/python/pycontainer.swg
@@ -1013,12 +1013,47 @@ namespace swig {
     }
   }
 
+  template <class Seq, class T = typename Seq::value_type >
+    static int assign_iterator_protocol(PyObject *obj, Seq **seq) {
+      int ret = SWIG_ERROR;
+      PyObject *iter = PyObject_GetIter(obj);
+      if (iter) {
+        PyObject *item = PyIter_Next(iter);
+        ret = SWIG_OK;
+        if (seq)
+          *seq = new Seq();
+        while (item) {
+          try {
+            if (seq) {
+              (*seq)->insert((*seq)->end(), swig::as<T>(item));
+            } else {
+              if (!swig::check<T>(item))
+                ret = SWIG_ERROR;
+            }
+          } catch (std::exception& e) {
+            if (seq) {
+              if (!PyErr_Occurred()) {
+                PyErr_SetString(PyExc_TypeError, e.what());
+              }
+            }
+            ret = SWIG_ERROR;
+          }
+          Py_DECREF(item);
+          item = (ret == SWIG_OK) ? PyIter_Next(iter) : 0;
+        }
+        Py_DECREF(iter);
+      }
+
+      return ret;
+    }
+
   template <class Seq, class T = typename Seq::value_type >
   struct traits_asptr_stdseq {
     typedef Seq sequence;
     typedef T value_type;
 
     static int asptr(PyObject *obj, sequence **seq) {
+      int ret = SWIG_ERROR;
       if (obj == Py_None || SWIG_Python_GetSwigThis(obj)) {
 	sequence *p;
 	swig_type_info *descriptor = swig::type_info<sequence>();
@@ -1045,8 +1080,40 @@ namespace swig {
 	  }
 	  return SWIG_ERROR;
 	}
+      } else {
+#if 0
+        PyObject *iter = PyObject_GetIter(obj);
+        if (iter) {
+          PyObject *item = PyIter_Next(iter);
+          ret = SWIG_OK;
+	  if (seq)
+            *seq = new sequence();
+          while (item) {
+            try {
+              if (seq) {
+                (*seq)->insert((*seq)->end(), swig::as<value_type>(item));
+              } else {
+                if (!swig::check<value_type>(item))
+                  ret = SWIG_ERROR;
+              }
+            } catch (std::exception& e) {
+              if (seq) {
+                if (!PyErr_Occurred()) {
+                  PyErr_SetString(PyExc_TypeError, e.what());
+                }
+              }
+              ret = SWIG_ERROR;
+	    }
+            Py_DECREF(item);
+            item = (ret == SWIG_OK) ? PyIter_Next(iter) : 0;
+          }
+          Py_DECREF(iter);
+        }
+#else
+      ret = swig::assign_iterator_protocol<Seq, T>(obj, seq);
+#endif
       }
-      return SWIG_ERROR;
+      return ret;
     }
   };
 
-- 
cgit v1.2.1