Function cast

include/pybind11/cast.h:1677–1691

                                  && !detail::is_same_ignoring_cvref<T, PyObject *>::value,
                              int> = 0>
T cast(const handle &handle) {
    using namespace detail;
    constexpr bool is_enum_cast = type_uses_type_caster_enum_type<intrinsic_t<T>>::value;
    static_assert(!cast_is_temporary_value_reference<T>::value || is_enum_cast,
                  "Unable to cast type to reference: value is local to type caster");
#ifndef NDEBUG
    if (is_enum_cast && cast_is_temporary_value_reference<T>::value) {
        if (detail::global_internals_native_enum_type_map_contains(
                std::type_index(typeid(intrinsic_t<T>)))) {
            pybind11_fail("Unable to cast native enum type to reference");
        }
    }
#endif
    return cast_op<T>(load_type<T>(handle));
}

// pytype -> pytype (calls converting constructor)
template <typename T, detail::enable_if_t<detail::is_pyobject<T>::value, int> = 0>