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Hey, what's up guys. My name is TheCherno and welcome back to my c++ series Today, we're going to be continuing on our adventure in object-orientated programming and talking about inheritance in c++. So, in object oriented programming there's a huge huge huge paradigm, and inheritance between classes is one of the fundamental aspects of it and one of the most powerful features that we can actually leverage. Inheritance allows us to have a hierarchy of classes which relate to each other. Or in other words, it allows us to have a base class which contains common functionality and then it allows us to kind of branch off from that class and create sub-classes from that initial parent class. The primary reason why this is so, so, useful is because it helps us avoid code duplication. Code duplication refers to whether we have to have the exact same code multiple times Doing maybe, slightly, different things and other time just exactly the same thing. Instead of us repeating ourselves over and over again, we can put all of our common functionality between classes into a parent class. And then simply make sub-classes from that base class. Which either change the functionality in subtle ways, or introduce entirely new functionality. But the idea is, inheritance gives us a way to put all that common code between a number of classes into a base class so that we don't have to keep repeating ourselves. Kind of like a template. So, let's take a look at how we can actually define that in our source code. Suppose that I had an entity class and this was going to govern pretty much every actual entity that I had in my game. We have a lot of very very specific entities in our game. However to some aspect, they will share functionality. For example, perhaps every entity has a position inside our game. This might be expressed through two floats, for example. So we'll have float x and float y. Next, we might want to give every entity the ability to move. Perhaps via a movement method. So we'll take in an xa and a ya being the amount that we want to move by. OK, great, so we have got a base entity class. Which basically says that every single entity we create in our game will have these traits. Let's go ahead and create a new type of entity, for example, player. We'll write our player class, for now with no concept of inheritance. So basically if we were doing this from scratch and we wanted this player to also have a position, because it is an entity and it makes sense for it to have a position inside out game. We will also want to get it to be able to move, so we would need the "move" function carried across. We would basically end up writing something that looks very similar to this (entity function) Maybe this player class has extra...