Function handle_nested_exception

include/pybind11/detail/internals.h:480–487

template <class T,
          enable_if_t<std::is_same<std::nested_exception, remove_cvref_t<T>>::value, int> = 0>
bool handle_nested_exception(const T &exc, const std::exception_ptr &p) {
    std::exception_ptr nested = exc.nested_ptr();
    if (nested != nullptr && nested != p) {
        translate_exception(nested);
        return true;
    }
    return false;
}

template <class T,
          enable_if_t<!std::is_same<std::nested_exception, remove_cvref_t<T>>::value, int> = 0>