Can anyone explain me how inheritance works under the hood in Objective-C ?
Lets say I have class B which inheritance class A. What is the glue between those two clases so class B to be able to access properties and methods of class A ?
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Can anyone explain me how inheritance works under the hood in Objective-C ?
Lets say I have class B which inheritance class A. What is the glue between those two clases so class B to be able to access properties and methods of class A ?
isa.The
isaidentifies the type at runtime, and refers to its dynamic ‘glue’ (see vtable). Because ofisa, the runtime knows (or is able to determine) which methods to perform when a message is sent, as well as the type ofself.When an instance is created, its
isais assigned.The other primary contributor is, of course, the compiler, which takes over when you get down to the lower levels — e.g. accessing instance variables directly and defining methods. There are a number of calls the compiler adds when creating objects and when messaging.