From c769fce28001167310a747d417aa0856a98efcc7 Mon Sep 17 00:00:00 2001
From: Wenzel Jakob <wenzel.jakob@epfl.ch>
Date: Thu, 3 Mar 2016 12:03:30 +0100
Subject: [PATCH] note about nullptr default args

---
 docs/advanced.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/advanced.rst b/docs/advanced.rst
index 1c2e4f48..f23ac53f 100644
--- a/docs/advanced.rst
+++ b/docs/advanced.rst
@@ -1007,6 +1007,15 @@ default argument manually using the ``arg_t`` notation:
     py::class_<MyClass>("MyClass")
         .def("myFunction", py::arg_t<SomeType>("arg", SomeType(123), "SomeType(123)"));
 
+Sometimes it may be necessary to pass a null pointer value as a default
+argument. In this case, remember to cast it to the underlying type in question,
+like so:
+
+.. code-block:: cpp
+
+    py::class_<MyClass>("MyClass")
+        .def("myFunction", py::arg("arg") = (SomeType *) nullptr);
+
 Partitioning code over multiple extension modules
 =================================================