@compatibility_alias allows you to define a class name as equivalent to another class name. For example:
@compatibility_alias WOApplication GSWApplication;
tells the compiler that each time it encounters
WOApplication as a class name, it should replace it with
GSWApplication (that is,
WOApplication is just an alias for
There are some constraints on how this can be used—
WOApplication(the alias) must not be an existing class;
GSWApplication(the real class) must be an existing class.
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