From 0102b319454feffaaad205c7eb028cc6da8210bf Mon Sep 17 00:00:00 2001
From: Jakob van Santen <jvansanten@gmail.com>
Date: Tue, 9 May 2023 11:37:27 +0200
Subject: [PATCH] Unwrap back_reference in get_pytype()

This prevents back_reference parameters from decaying to "object" in py signatures
---
 include/boost/python/converter/pytype_function.hpp | 8 +++++++-
 test/map_indexing_suite.py                         | 7 +++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/boost/python/converter/pytype_function.hpp b/include/boost/python/converter/pytype_function.hpp
index 8e0a4e79..d072b55f 100644
--- a/include/boost/python/converter/pytype_function.hpp
+++ b/include/boost/python/converter/pytype_function.hpp
@@ -9,7 +9,7 @@
 # include <boost/python/converter/registered.hpp>
 #  include <boost/python/detail/unwind_type.hpp>
 #  include <boost/python/detail/type_traits.hpp>
-
+# include <boost/python/back_reference.hpp>
 
 namespace boost { namespace python {
 
@@ -46,6 +46,12 @@ inline python::type_info unwind_type_id_(boost::type<T>* = 0, mpl::false_ * =0)
     return boost::python::detail::unwind_type<unwind_type_id_helper, T> ();
 }
 
+template <class T>
+inline python::type_info unwind_type_id_(boost::type<back_reference<T> >* = 0, mpl::false_ * =0)
+{
+    return boost::python::detail::unwind_type<unwind_type_id_helper, T> ();
+}
+
 inline python::type_info unwind_type_id_(boost::type<void>* = 0, mpl::true_* =0)
 {
     return type_id<void>();
diff --git a/test/map_indexing_suite.py b/test/map_indexing_suite.py
index e772bb53..6d3e57a1 100644
--- a/test/map_indexing_suite.py
+++ b/test/map_indexing_suite.py
@@ -214,6 +214,13 @@ joel kimpo
 ...     i.data()
 4
 
+#####################################################################
+# Test signature...
+#####################################################################
+
+>>> AMap.__iter__.__doc__.strip().split("\\n")[0]
+'__iter__( (AMap)arg1) -> __main__.iterator :'
+
 #####################################################################
 # END....
 #####################################################################