When is it appropriate to use C as object oriented language?

Question

There are a lot of excellent answers how can one simulate object oriented concepts with C. To name a few:

• C double linked list with abstract data type
• C a

Answer 1

When you want a cross-platform foundation for object-oriented APIs. A case in point is Apple's Core Foundation. Being entirely C, it could be easily ported, yet provides an extremely rich set of opaque objects to use.

A nice example of its flexibility is the way many of its types are 'toll-free' bridged with those from Foundation (a set of true OO Objective-C libraries). Many types from Core Foundation can be used, fairly naturally, in Foundation APIs, and vice-versa. It's hard to see this working so well without some OO concepts being present in the Core Foundation libraries.