![]() The important thing to understand is that if a variable appears in a member constructor list, the declaration initialization will not be executed. In M圜lass, we also use a member constructor list with M圜lass(int x_value, int y_value). We could have used any of the initialization types. In M圜lass and MyStruct, we used value initialization to assign the variables x and y. The first step is accomplished through the alloc class method, inherited from NSObject and rarely, if ever, overridden. ![]() In addition to letting you pick which constructor of the parent class gets called, the initialization list also lets you specify which constructor gets called for the objects that are fields of the class. First, memory has to be allocated for the object, then the object is initialized with proper values. Static initialization is meant to enable the construction of C objects - that is, to set them to a known state before main begins. When a class is destructed, the destructors are called in the exact opposite order as the constructors. Creating a new object in Objective-C is usually a two-step process. Order isn’t too important in M圜lass but in some cases, it matters. The constructor of the enclosing class is called last. Member variables within classes have a few things to consider in addition to local variable initialization.įirst, variables are initialized (including calling constructors) in the order they are declared. brace (aka curly brackets) initialization ![]() direct initialization using parenthesis (aka round brackets) ![]()
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