Method get_event

imperative/src/impl/physical_tensor.cpp:120–128

get a real event t' such that t <= t'

    // get a real event t' such that t <= t'
    std::pair<uint64_t, CompNode::Event*> get_event(
            CompNode cn, size_t cnid, uint64_t t, std::unique_lock<std::mutex>& lock) {
        auto& cndata = m_cndata[cnid];
        auto it = cndata.events.lower_bound(t);
        if (it == cndata.events.end()) {
            it = do_record(cn, cnid, lock);
        }
        return {it->first, it->second.get()};
    }

    size_t get_cnid_unsafe(CompNode cn) {
        auto [it, unseen] = m_cn2id.try_emplace(cn, m_cndata.size());