memory management - difference between drain and release -

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i want know difference between drain , release in memory management..please me suitable example.

in garbage collected environment, release no-op. nsautoreleasepool therefore provides drain method in reference-counted environment behaves same calling release, in garbage collected environment triggers garbage collection (if memory allocated since last collection greater current threshold). typically, therefore, should use drain rather release dispose of autorelease pool.

source: http://developer.apple.com/library/mac/#documentation/cocoa/conceptual/memorymgmt/articles/mmautoreleasepools.html


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