Objective-C 2.0 Runtime System Programming Guide

Objective-C language defers as much as possible from compile and link time to runtime. It always opts for dynamic solutions whenever feasible. This necessitates not just a compiler but also a runtime system to execute compiled code. The runtime system here acts akin to an operating system for Objective-C, upon which the language relies. This document specifically details the NSObject class and how Objective-C programs interact with the runtime system. In particular, it explains dynamic runtime addition at runtime.
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