Incomplete types

The ANSI C standard introduced the term ``incomplete type'' to formalize a fundamental, yet misunderstood, portion of C, implicit from its beginnings. This article describes incomplete types, where they are permitted, and why they are useful.

This section is organized as follows:

• ``Types''

• ``Completing incomplete types''

• ``Declarations''

• ``Expressions''

• ``Justification''

• ``Examples''