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Objective-C Programming: The Big Nerd Ranch Guide by Mikey Ward, Aaron Hillegass

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Zeroing of weak references

To see weak references in action, let’s add another array to the mix. What if you wanted an array of all assets – even ones that have not been assigned to a particular employee? You could add the assets to an array as they are created. Add a few lines of code to main.m:

#​i​m​p​o​r​t​ ​<​F​o​u​n​d​a​t​i​o​n​/​F​o​u​n​d​a​t​i​o​n​.​h​>​ #​i​m​p​o​r​t​ ​"​B​N​R​E​m​p​l​o​y​e​e​.​h​"​ #​i​m​p​o​r​t​ ​"​B​N​R​A​s​s​e​t​.​h​"​ i​n​t​ ​m​a​i​n​(​i​n​t​ ​a​r​g​c​,​ ​c​o​n​s​t​ ​c​h​a​r​ ​*​ ​a​r​g​v​[​]​)​ {​ ​ ​ ​ ​@​a​u​t​o​r​e​l​e​a​s​e​p​o​o​l​ ​{​ ​ ​ ​ ​ ​ ​ ​ ​/​/​ ​C​r​e​a​t​e​ ​a​n​ ​a​r​r​a​y​ ​o​f​ ​E​m​p​l​o​y​e​e​ ​o​b​j​e​c​t​s​ ​ ​ ​ ​ ​ ​ ​ ​N​S​M​u​t​a​b​l​e​A​r​r​a​y​ ​*​e​m​p​l​o​y​e​e​s​ ​=​ ​[​[​N​S​M​u​t​a​b​l​e​A​r​r​a​y​ ...

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