Questions tagged [polymorphism]

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Remove nested if statements

I have been learning a new method of programming. I have been programming many years and am recently finding out there is a better method in general via abstract classes. My question is how to ...
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1answer
26 views

Interact with inheriting class methods from “casted” base class (collisions, etc)

I want to implement a damage system that works across both living items (Entity) and environment items (Environment). The key ...
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1answer
229 views

RPG Item Design [duplicate]

I'm currently fiddling around with some RPG mechanics and I'm trying to implement a solid way to handle items that have different on use effects. Currently, I have a base class called "Item" that ...
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2answers
388 views

Using polymorphism in an Entity-Component System without sacrificing data-oriented design

I've been planning out an Entity-Component System in C++. My idea of it is most in line with the one described on this page of the entity systems wiki. To summarize, components are just structs of ...
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2answers
65 views

How to: Duplicating and updating component data in systems

I am new to game development. Coming across the ECS (entity-component system) pattern I generally quite liked the idea. I have implemented the current version of my engine using the OOP style approach....
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1answer
308 views

Make the components of an ECS polymorphic

I have implemented an entity component sytsem (ECS) in my game engine (SFML and C++ 17). An entity has an array of components. You can get a components by its type e.g.: ...
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1answer
358 views

Component based Entity System using polymorphism: OpenGL does not render

I want to be able to create Entities from different Component sets. I want to call Entity entity(new StaticObject(modelpath, position)); I have an EntityTypes ...
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2answers
211 views

Cost of Using Virtual Methods to Query Properties?

Let's say you're making a tile-based roll-playing game, and you're obsessed with OOP. You have an abstract base class Tile which will be inherited from by many ...
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1answer
191 views

Inherited property in derived class reference only base class

[Context] I am developing a game in Unity, and wanted to make a Game Manager. Like many examples out there, it uses a Singletron design pattern. But i have several other Managers, all using Singletron ...
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1answer
414 views

'Ball.rigidbody' hides inherited member 'Component.Rigidbody'

I have some understanding of c# and I am new to unity. I am currently making a 3D project which use the Rigidbody component on the ball object. When I use following code: ...
2
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1answer
2k views

Unity polymorphism in editor through a list

So I have an ItemDatabase class which basically only has a list of Item ...
6
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1answer
5k views

Unity3D [C#]: How do I use a custom inspector to expose an array of polymorphic objects to edit?

[EDIT: based on some feedback, I pruned the example down to the base functionality of the bug we are trying to solve. The description below remains accurate, but the repro has been shortened to: Add ...
3
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1answer
1k views

Collision Shapes Abstraction Design

Straight to the facts. I have a base CEntity class for different entities in my game: Static entities ( those do not move, simply props and items ) Dynamic entities ( these move, jump ) Each of ...
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1answer
117 views

Interface or Class Inheritance [closed]

I am making an inventory system. Different inventory item will have different uses so i am thinking about making a base class called InventoryItem and derive Wood, Gold, Weapons and so on. This way ...
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3answers
821 views

Flexible alternatives to many many small polymorphic classes (for use as properties or messages or events) C++

There are two classes in my game that are really useful, but slowly becoming a pain. Message and Property (property is essentially a component). They both derive from a base class and contain a ...
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4answers
2k views

Inheritance Hierarchy and Design — avoiding multiple inheritance

I am working on a 3D game, and need some advice about how to best design and structure my code so that I achieve what I'm going for without using bad practices like multiple inheritance. Basically ...
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1answer
2k views

Creating an abstract Animation class

I'm creating a simple 2d game with c++ and SFML, and I've got a simple framework going for animating a sprite using a "SpriteSheet" image (an big image containing all the "frames" of an animation) I'...
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1answer
522 views

Problem creating levels using inherited classes/polymorphism

I'm trying to write my level classes by having a base class that each level class inherits from...The base class uses pure virtual functions. My base class is only going to be used as a vector that'...
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2answers
131 views

How to handle similar actions in derived actors (inheritance)

I have a base class called Attacker that has a update method. The update method moves ...
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2answers
757 views

Component-based entities without IDs?

I'd like to know if someone has found a way to build a component-based entity system in their game(s) without using IDs. I find that IDs tend to do away with one of the major (possible) advantages of ...