This is the beginning of a series about the vector container of the C++ Standard Template Library. While there are numerous resources discussing how and when to use this container, this series will be a little bit more advanced. We will get our hands dirty by ruthlessly dissecting the vector container source code. People usually (or never) talk about the source code mainly because there is no need to know anything about it. However, I always like to see what’s happening behind the scenes and so I’ve started this series. It will be hard because the source code is not well-documented and I haven’t seen any articles going at this depth. I will do my best to present the information as accurately as possible. The beginning will be about the programmatic aspects of the vector template and then I will slowly move towards the theory behind it. This part will introduce you to the vector template source code.