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Lesson 18 - Introducing Vector in C++

In the previous lesson, Template Classes in C++, we talked about template classes. In today's C++ tutorial, we're going to introduce a container that is smarter than an array. Mainly, because it allows us to add or remove items from it at it also frees its memory automatically. In principle, it's a resizable array similar to the one we programmed in the previous lessons.

We've already used the term "container" in this course. It's a structure where multiple objects can be stored. There are lots of container in C++, designed for different purposes, and these can be used in different ways. We know that the array has a constant size, which is a price paid for its high speed. We also created our own resizable array. Vector works very similarly. For our online course, we're going to need a smart container to which we can easily add or remove items while the program is running. Surely we'd like to maintain a database of some objects in memory like this.


Vector is a template container. Let's start easily and make a container of numbers that we'll generate randomly. Before we can use the vector, we need to include it. This is done by adding


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In this tutorial, we'll talk about one of the most basic containers in C++ - Vector.

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Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn university The author learned IT at the Unicorn University - a prestigious college providing education on IT and economics.
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