Method UnlinkRef

src/txgraph.cpp:730–769

Only called by Ref::~Ref to unlink Refs, and Ref's move assignment. */

    /** Only called by Ref::~Ref to unlink Refs, and Ref's move assignment. */
    void UnlinkRef(GraphIndex idx) noexcept final
    {
        auto& entry = m_entries[idx];
        Assume(entry.m_ref != nullptr);
        Assume(m_main_chunkindex_observers == 0 || !entry.m_locator[0].IsPresent());
        // Remove all chunk index entries for the affected cluster, to avoid any chunk indexes
        // referencing unlinked/destroyed Refs.
        if (entry.m_locator[0].IsPresent()) {
            entry.m_locator[0].cluster->RemoveChunkData(*this);
        }
        entry.m_ref = nullptr;
        // Mark the transaction as to be removed in all levels where it explicitly or implicitly
        // exists.
        bool exists_anywhere{false};
        bool exists{false};
        for (int level = 0; level <= GetTopLevel(); ++level) {
            if (entry.m_locator[level].IsPresent()) {
                exists_anywhere = true;
                exists = true;
            } else if (entry.m_locator[level].IsRemoved()) {
                exists = false;
            }
            if (exists) {
                auto& clusterset = GetClusterSet(level);
                clusterset.m_to_remove.push_back(idx);
                // Force recomputation of grouping data.
                clusterset.m_group_data = std::nullopt;
                // Do not wipe the oversized state of main if staging exists. The reason for this
                // is that the alternative would mean that cluster merges may need to be applied to
                // a formerly-oversized main graph while staging exists (to satisfy chunk feerate
                // queries into main, for example), and such merges could conflict with pulls of
                // some of their constituents into staging.
                if (level == GetTopLevel() && clusterset.m_oversized == true) {
                    clusterset.m_oversized = std::nullopt;
                }
            }
        }
        m_unlinked.push_back(idx);
        if (!exists_anywhere) Compact();
    }

    // Functions related to various normalization/application steps.
    /** Get rid of unlinked Entry objects in m_entries, if possible (this changes the GraphIndex