What are some alternatives to std::map in C++11?

What are some alternatives to std::map in C++11?

In C++11, you can consider using std::unordered_map for faster average-case lookups, or boost::flat_map for better memory locality.

What are the performance differences between std::map and std::unordered_map?

std::map is implemented as a balanced tree, providing O(log n) complexity for insertions and lookups, while std::unordered_map uses a hash table, offering average O(1) complexity.

Are there any specific use cases where std::map is preferred over std::unordered_map?

Yes, std::map is preferred when you need ordered keys or when you require range queries, as it maintains the order of elements.

Can you explain how boost::flat_map works?

boost::flat_map stores elements in a sorted vector, which can be more cache-friendly and faster for small datasets, but it requires linear time for insertions.