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If a pointer specifies a point in memory, would the amount of space a pointer takes not be dependent on how much memory it could possibly range over?

So for example, if we have 4 locations of memory and a pointer, then the pointer can be 2 bits, but if we have $2^k$, we will need $k$ bits.

My confusion stems from people who say that a fixed number of pointers is $O(1)$ space complexity.

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