natweiss / entityfu

A lightweight entity component system (ECS) written in C++.

EntityFu

A simple, fast entity component system written in C++. Originally built for the game Songbringer and adapted for release.

Only two files need to be included in your game project: EntityFu.h and EntityFu.cpp.

See main.cpp for example code.

Basically:

• An entity is simply just an integer ID.
• Components are pure data representing aspects of an entity.
• Systems are where the code goes to operate on components.

Here's an intro to entity component systems.

Ports

@bwoogie ported Entity Fu to C#

License

EntityFu is licensed under the MIT license.

entityfu's Issues

How to judge a component does not exist

template<class ComponentClass> inline static ComponentClass& get(Eid eid)
if the component is null, that return a static 'ComponentClass component'
but how to judge it exist?

Bug in testcode in main.cpp

When I run the main.cpp I get an Assertion:
vector iterator not incrementable

It happens after Entity 2 gets to 0 health and gets destroyed.

I could fix it by changing this:

for (auto eid : Entity::getAll<HealthComponent>())

to this:

auto vec = Entity::getAll<HealthComponent>();
for (auto eid : vec)

LNK2001 error when compiling in visual studio 2015

I just put entityfu into my project and I compile it and get this error

unresolved external symbol "public:static unsigned int Entity::Component::numCids" (? numcids@component@Entity@@21A)