Method ChangeAndReselect

src/txrequest.cpp:429–443

Change the state of an announcement to something non-IsSelected(). If it was IsSelected(), the next best announcement will be marked CANDIDATE_BEST.

    //! Change the state of an announcement to something non-IsSelected(). If it was IsSelected(), the next best
    //! announcement will be marked CANDIDATE_BEST.
    void ChangeAndReselect(Iter<ByTxHash> it, State new_state)
    {
        assert(new_state == State::COMPLETED || new_state == State::CANDIDATE_DELAYED);
        assert(it != m_index.get<ByTxHash>().end());
        if (it->IsSelected() && it != m_index.get<ByTxHash>().begin()) {
            auto it_prev = std::prev(it);
            // The next best CANDIDATE_READY, if any, immediately precedes the REQUESTED or CANDIDATE_BEST
            // announcement in the ByTxHash index.
            if (it_prev->m_txhash == it->m_txhash && it_prev->GetState() == State::CANDIDATE_READY) {
                // If one such CANDIDATE_READY exists (for this txhash), convert it to CANDIDATE_BEST.
                Modify<ByTxHash>(it_prev, [](Announcement& ann){ ann.SetState(State::CANDIDATE_BEST); });
            }
        }
        Modify<ByTxHash>(it, [new_state](Announcement& ann){ ann.SetState(new_state); });
    }

    //! Check if 'it' is the only announcement for a given txhash that isn't COMPLETED.
    bool IsOnlyNonCompleted(Iter<ByTxHash> it)