What is the std::vector::push_back function in C++?

Can you explain what the std::vector::push_back function does in C++?

Sure! The std::vector::push_back function adds a new element to the end of a vector, increasing its size.

How does it handle memory allocation when adding elements?

When you use push_back, if the current capacity is reached, the vector will allocate more memory to accommodate the new element.

Is there a performance cost associated with using push_back?

Yes, if a reallocation occurs, it can be costly. However, if you reserve space in advance, it can improve performance.

Can I use push_back with custom objects?

Absolutely! You can use push_back with any type, including custom objects, as long as they are copyable or movable.