This document is meant to describe some of the GNU Objective-C features. It is not intended to teach you Objective-C. There are several resources on the Internet that present the language.
:: _gnu-objective-c-runtime-api:
:: _executing-code-before-main:
:: _type-encoding:
:: _garbage-collection:
:: _constant-string-objects:
:: _compatibility_alias:
:: _exceptions:
:: _synchronization:
:: _fast-enumeration:
:: _messaging-with-the-gnu-objective-c-runtime: