How do I avoid rehashing overhead with std::map for embedded targets?

To avoid rehashing overhead when using std::map in C++, especially in embedded targets with constrained resources, you can take the following approaches:

• Reserve capacity: Whenever possible, reserve space ahead of time to prevent resizing and rehashing.
• Use unordered containers: If your keys are unique and you need fast access, consider using std::unordered_map, which typically has lower overhead.
• Preallocate elements: Initialize your map with a set number of elements to minimize dynamic memory allocation.
• Utilize custom allocators: In embedded systems, using custom memory pools or allocators can help manage dynamic memory more efficiently.