Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Objective-C Basics (Retired) Introduction to Objective-C Composition

Baran Ureten
Baran Ureten
5,749 Points

Why didn't we have to allocate and initiate "Shape" in main.m ??

Don't we need to also include

Shape *shape = [[Shape alloc]init];

in main.m ?

1 Answer

Sam Chaudry
Sam Chaudry
25,519 Points

Hi Baran

The reason you use alloc in Objective C is that every object that is create needs some memory allocated to it when it it run. So using alloc does exactly this, the use of initialisation or init just gets the object ready when it is run by the main thread i.e. main.m or the main path of execution.

Hope that helps