Method evict_if_needed

src/formats/avml_format.cpp:102–112

private:
    void evict_if_needed() {
        while (cur_bytes_ > max_bytes_ && !order_.empty()) {
            std::size_t victim = order_.back();
            auto it = map_.find(victim);
            if (it != map_.end()) {
                cur_bytes_ -= it->second.bytes.size();
                map_.erase(it);
            }
            order_.pop_back();
        }
    }

    struct Entry {
        std::list<std::size_t>::iterator it;