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Question Does Unity recycle GetInstanceID in the same session?

Discussion in 'Editor & General Support' started by yosimba2000, Sep 15, 2022.

  1. yosimba2000

    yosimba2000

    Joined:
    Jun 3, 2021
    Posts:
    25
    For example, I spawn Gameobject A and it has InstanceID 123.

    I then destroy Gameobject A, and spawn Gameobject B.

    Is it possible for Gameobject B to have instanceID 123 now that Gameobject A no longer exists?
     
    yosimba2000, Sep 15, 2022
    #1

  2. Kurt-Dekker

    Kurt-Dekker

    Joined:
    Mar 16, 2013
    Posts:
    36,749
    I would start with the docs. Anything not promised should not be relied upon.
     
    Kurt-Dekker, Sep 15, 2022
    #2

  3. yosimba2000

    yosimba2000

    Joined:
    Jun 3, 2021
    Posts:
    25
    The docs only mention that the InstanceIDs are guaranteed to be unique, nothing about if they are recycled when a GO is destroyed. Guess it's safer to assume they will be recycled, huh :)
     
    yosimba2000, Sep 15, 2022
    #3
    Kurt-Dekker likes this.

  4. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
    10,504
    It's implemented as an ever increasing unsigned integer, so they shouldn't be recycled, unless you run your game long enough that it overflows and starts from 0 again (which is possible on 32-bit platforms, but unlikely on 64-bit platforms).
     
    Tautvydas-Zilys, Sep 15, 2022
    #4
    evyatron likes this.

  5. yosimba2000

    yosimba2000

    Joined:
    Jun 3, 2021
    Posts:
    25
    That's exactly what I was hoping for, thanks for confirming!
     
    yosimba2000, Sep 16, 2022
    #5