What are the best practices for using std::vector in C++?

What are the best practices for using std::vector in C++?

When using std::vector, consider the following best practices: 1. Reserve space to avoid multiple reallocations. 2. Use emplace_back for efficiency. 3. Prefer using iterators over indices for better readability.

Can you explain why reserving space is important?

Reserving space in a vector helps to minimize reallocations, which can be costly in terms of performance. It allocates memory in advance, reducing the need for the vector to resize and copy elements when it grows.

What is the difference between push_back and emplace_back?

The push_back method copies or moves an object into the vector, while emplace_back constructs the object in place, which can be more efficient as it avoids unnecessary copies.

Are there any performance considerations I should be aware of?

Yes, be mindful of the vector's capacity and size. Frequent resizing can lead to performance hits. Also, avoid using std::vector for large objects; consider using pointers or smart pointers instead.