Fix optional dereference type deduction

556277d6 · fatvlady · Wenzel Jakob · a3daf87d · 556277d6
Commit 556277d6 authored Mar 14, 2020 by fatvlady Committed by Wenzel Jakob Jun 29, 2020
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include/pybind11/stl.h
+2 -1

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--- a/include/pybind11/stl.h
+++ b/include/pybind11/stl.h
@@ -266,7 +266,8 @@ template<typename T> struct optional_caster {
    static handle cast(T_ &&src, return_value_policy policy, handle parent) {
        if (!src)
            return none().inc_ref();
-        policy = return_value_policy_override<typename T::value_type>::policy(policy);
+        using dereference_type = decltype(*std::forward<T_>(src));
+        policy = return_value_policy_override<dereference_type>::policy(policy);
        return value_conv::cast(*std::forward<T_>(src), policy, parent);
    }