add note about custom type casters (fixes #480)

45e6e6f6 · Wenzel Jakob · 12edaaa6 · 45e6e6f6
Commit 45e6e6f6 authored Nov 04, 2016 by Wenzel Jakob
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docs/advanced/cast/custom.rst
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--- a/docs/advanced/cast/custom.rst
+++ b/docs/advanced/cast/custom.rst
@@ -77,3 +77,9 @@ type is explicitly allowed.
            }
        };
    }} // namespace pybind11::detail
+
+.. warning::
+
+    When using custom type casters, it's important to declare them consistently
+    in every compilation unit of the Python extension module. Otherwise,
+    undefined behavior can ensue.