mutate()

bool MayaFlux::Nodes::HookList::mutate ( const std::function< bool(std::vector< HookEntry > &)> &  edit )

private

Definition at line 111 of file NodeUtils.cpp.

{
    for (;;) {
        m_readers.fetch_add(1);
 
        const std::vector<HookEntry>* current = m_head.load();
 
        auto next = std::make_unique<std::vector<HookEntry>>();
        if (current) {
            *next = *current;
        }
 
        const bool changed = edit(*next);
        bool swapped = false;
        if (changed) {
            const std::vector<HookEntry>* replacement = next->empty() ? nullptr : next.get();
            const std::vector<HookEntry>* expected = current;
            swapped = m_head.compare_exchange_strong(expected, replacement);
            if (swapped && replacement) {
                next.release();
            }
        }
 
        m_readers.fetch_sub(1);
 
        if (!changed) {
            return false;
        }
        if (swapped) {
            if (current) {
                retire(current);
            }
            reclaim();
            return true;
        }
    }
}

References current, m_head, m_readers, reclaim(), and retire().

Referenced by add(), add_conditional(), add_conditional_unique(), add_unique(), clear(), remove(), remove_by_condition_key(), remove_by_key(), remove_by_tag(), and remove_first_by_key().

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