Three new features were introduced into clang at the same time: NSNumber Literals provide a syntax for creating NSNumber from scalar literal expressions; Collection Literals provide a short-hand for creating arrays and dictionaries; Object Subscripting provides a way to use subscripting with Objective-C objects. Users of Apple compiler releases can use these features starting with the Apple LLVM Compiler 4.0. Users of open-source LLVM.org compiler releases can use these features starting with clang v3.1. These language additions simplify common Objective-C programming patterns, make programs more concise, and improve the safety of container creation.

This document describes how the features are implemented in clang, and how to use them in your own programs.