Assume I have a class A that has say 3 methods. So the first methods assigns some values to the first array and the rest of the methods in order modify what is computed by the previous method. Since I wanted to avoid designing the methods that return an array (pointer to local variable) I picked 3 data member and store the intermediate result in each of them. Please note that this simple code is used for illustration. Assume I have a class A that has say 3 methods.
阅读背景：
如何避免在类中返回指针
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