How do I use the reserve function with C++ STL vectors?

What does the reserve function do in C++ STL vectors?

The reserve function in C++ STL vectors is used to allocate memory for a specified number of elements, which can improve performance by reducing the number of reallocations.

How do I use the reserve function in my code?

You can use it like this: myVector.reserve(n); where n is the number of elements you want to reserve space for.

Does using reserve affect the size of the vector?

No, using reserve does not change the size of the vector; it only changes the capacity.

When should I use reserve in my programs?

You should use reserve when you know the number of elements you will need in advance, to optimize memory allocation.