Function MemoizeLru

cpp/src/arrow/util/cache_internal.h:190–195

// Apply a LRU memoization cache to a callable.
template <typename Func>
static auto MemoizeLru(Func&& func, int32_t cache_capacity)
    -> decltype(detail::Memoize<LruCache, detail::ThreadSafeMemoizer>(
        std::forward<Func>(func), cache_capacity)) {
  return detail::Memoize<LruCache, detail::ThreadSafeMemoizer>(std::forward<Func>(func),
                                                               cache_capacity);
}

// Like MemoizeLru, but not thread-safe.  This version allows for much faster
// lookups (more than 2x faster), but you'll have to manage thread safety yourself.