How does memory usage work in C++11's std::unordered_map?

Can you explain how memory usage works in C++11's std::unordered_map?

Sure! In C++11, std::unordered_map uses a hash table for storage, which can lead to varying memory usage depending on the load factor.

What factors affect the memory consumption of std::unordered_map?

The main factors include the number of elements, the load factor, and the hash function used. A higher load factor can reduce memory usage but may affect performance.

How can I optimize memory usage in std::unordered_map?

You can optimize memory by choosing an appropriate initial bucket count and load factor, and by using a custom hash function that minimizes collisions.

Are there any alternatives to std::unordered_map for better memory efficiency?

Yes, alternatives like std::map or other data structures like trie or flat_map may offer better memory efficiency depending on your use case.