What are the differences between std::unordered_map and std::map in C++17?

Can you explain the differences between std::unordered_map and std::map in C++17?

Sure! The main difference is that std::map is ordered and uses a binary tree, while std::unordered_map is unordered and uses a hash table.

What are the performance implications of using one over the other?

std::unordered_map generally offers average constant time complexity for lookups, while std::map has logarithmic time complexity due to its tree structure.

Are there any specific use cases where one is preferred over the other?

Yes, use std::unordered_map when you need fast access and don't care about order. Use std::map when you need sorted keys.

What about memory usage? Is one more memory efficient?

std::unordered_map may use more memory due to its hash table structure, which requires additional space for buckets.