iphone - Synthesize a BOOL to set value in Objective C -

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I have created a BOOL feature called "useSystem" in my core data unit, except for me to get / set up data I have created an object for that, even then whenever I try to set synthesized BOOL I just get an error. This is my code: 

  @property (nonatomic) const bool usage system;

So I'm 

  [Object set US system: Yes];

And immediately I just get an error, can anyone help?

Use [NSNumber numberWithBool: Yes]


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