C++: std::vector vs std::deque

What are the main differences between std::vector and std::deque in C++?

The main differences are in their memory allocation and performance characteristics. std::vector is a dynamic array, while std::deque is a double-ended queue.

When should I use std::vector over std::deque?

Use std::vector when you need fast random access and are primarily adding/removing elements at the end. It's more memory efficient.

And when is std::deque a better choice?

std::deque is better when you need to add or remove elements from both ends frequently, as it allows for efficient operations at both the front and back.

Are there any performance trade-offs I should be aware of?

Yes, std::vector has better cache locality, which can lead to better performance in many scenarios, while std::deque may have more overhead due to its structure.