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Home/ Questions/Q 6171193
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T23:10:16+00:00 2026-05-23T23:10:16+00:00

Suggest me the difference between the release , autorelease, drain , nil and null.

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Suggest me the difference between the release , autorelease, drain , nil and null.
When the dealloc method of the application is call?

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  1. Editorial Team
    Editorial Team
    2026-05-23T23:10:18+00:00Added an answer on May 23, 2026 at 11:10 pm

    Release: Decrease retain count by 1

    Autorelease: Deleayed release, will decrease retain count by 1 when the autoreleasepool is drained, which is most likely in the next run but not guaranteed.

    Drain: To drain the autorelease pool

    Nil: Null for objective C objects

    Null: Null for C pointers.

    Just to put in the answer what @Kendall Helmstetter Gelner said, the dealloc method will get called when the retain count reaches 0.

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