C++ Map Lookup Memoization

By Lu Pan in c++ on 05 May 2021

Memoization is an old technique. It's basically caching outputs for giving inputs (usually in a map). But a map lookup itself is not free. How can we memoize map lookups? I learned from my coworker this nifty trick recently. Let's say we have a map (e.g. std::unordered_map<…