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How does dispatch_once manages to run only once?
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Answer / Pankaj Kumar Yadav
dispatch_once is a macro in Objective-C that ensures a block of code is executed exactly once during the lifetime of a program. It uses thread local storage and a static variable to check if the code has been executed before. If not, it executes the block and sets the variable to true, ensuring the same block will not run again.
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