ios - Possibilities of Singleton instance getting deallocated automatically -

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i creating singleton instance below:

+(mysingleton*)sharedinstance  {           static mysingleton sharedobject = nil;        static dispatch_once_t predicate = 0;      dispatch_once(&predicate, ^{          sharedobject = [[mysingleton alloc] init];     });     return sharedobject;   }

what possibilities of sharedobject getting deallocated automatically?

how can sure sharedobject remain in memory until app terminated?

as answer rightly points out, shared singleton never deallocated. there 2 parts answer "why", both of come following line:

static mysingleton * sharedobject = nil;

first, static. static, when used inside of function this, modifies lifetime of variable, changing automatic, implicit default, static. means variable exists entire lifetime of program.

second, declaration makes sharedobject strong reference. variables in objective-c strong default, pedantic, have written:

static __strong mysingleton * sharedobject = nil;

so: have variable lives entire duration of program (static), , maintains strong reference object represents (__strong). these 2 pieces of information, plus fact never change object variable points, can deduce sharedobject never deallocated.


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