Won't this infinitely create new objects?

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
    static std::vector<CEntity*> EntityList;


In the .cpp file.
std::vector<CEntity*> CEntity::EntityList;
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No. Vectors don't allocate memory for objects unless you tell them too.

It doesn't know how many objects to create.
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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?
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.
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