Won't this infinitely create new objects?

[Malaxiz]

Because in every object there will be a vector of CEntity's created? Or will it not because it is static? And why do I need to type it again in the cpp file?

In the .h file.

class CEntity
{
public:
    static std::vector<CEntity*> EntityList;

...

In the .cpp file.

std::vector<CEntity*> CEntity::EntityList;

[N36fSL3A]

No. Vectors don't allocate memory for objects unless you tell them too.

It doesn't know how many objects to create.

[Malaxiz]

Ok, but when I want to use the vector do I just type CEntity::EntityList or does all the different objects I make of CEntity have a vector for themselfs?

[keskiverto]

That vector stores pointers, not CEntity objects. That alone prevents recursion.

It is static, so there is only one vector.

ODR -- One Definition Rule. The constructor of the static vector must be called exactly once within the binary. The line in .cpp generates that call to constructor.