Method reset

imperative/src/include/megbrain/imperative/value.h:468–477

* \brief reset underlying value to another value * * \param successor new value */

     * \param successor new value
     */
    inline void reset(ValueRef successor) {
        static_assert(std::is_base_of_v<ObjectValue<T>, T>);
        mgb_assert(m_storage);
        mgb_assert(!m_storage->m_successor);
        if (m_storage->m_watching) {
            debug::notify_event("reset");
        }
        m_storage->clear();
        m_storage->m_successor = ValueRef(successor.storage());
    }

    static inline const TypedValueRef nil;