What are some tips for using std::vector in C++?

What are some tips for using std::vector in C++?

Here are some tips for using std::vector in C++: 1. Always reserve space if you know the size in advance to avoid reallocations. 2. Use emplace_back() for better performance when adding elements. 3. Be cautious with iterators when modifying the vector.

Can you explain the difference between push_back and emplace_back?

Sure! push_back adds a copy of the element to the end of the vector, while emplace_back constructs the element in place, which can be more efficient.

What happens if I access an out-of-bounds index?

Accessing an out-of-bounds index leads to undefined behavior. It's best to use the at() method, which throws an exception if the index is invalid.

How can I iterate through a vector?

You can iterate through a vector using a range-based for loop, traditional for loop, or iterators. For example: for (const auto& item : myVector) { /* process item */ }.